THEORETICAL PAPERS, 1891, 1892. Analysis of the Spectrum of So- Méthode nouvelle pour la recherche des bandes faibles dans les spectres de bandes. Application aux spectres des hydrocarbons. (Read March 31.) On the Relations between the Lines of Various Spectra. (April.) On Homologous Spectra. (Sept.) On Selective and Metallic Reflexion. (Read Nov. 12.) Analysis of the Spectrum of Sodium, including an Inquiry into the True Place of the Lines that have been regarded as Satellites. (Read Nov. 18.) Uebersichtliche Darstellung der mathematischen Theorien über die Dispersion des Lichtes. I. Theil. (Hannover, Bacmeister, 1890. 50 pp.) II. Theil. Anomale Dispersion. (Erfurt, Bacmeister. 1891. 54 pp.) 1892. Ueber das sogenannte zweite oder zusammengesetzte Wasserstoffspectrum von Dr. B. Hasselberg, und die Structur des Wasserstoffs. 1. Theil. Empirisch-Induction-Abtheilung. (Read Feb. 4.) Essay on the Theory of Dispersion and Absorption.(InRussian.) (Feb.) Sul potere rifrangente per un raggio di lunghezza d' onda infinita. (March.) Trans. Roy. Soc. Dubl.' [2], iv. 563-608; Proc. Roy. Soc. Dubl.' [N.S.], vii. 201-203 (Abs.); 'Phil. Mag.' [5], xxxiii. 503-516 (Abs.); Nature,' xliii. 551-552 (Abs.); Beiblätter,' xvi. 531-532 (Abs.) 'C. R.' cxii. 661-663; 'Zeitschr. f. physikal. Chem.' viii. 144 (Abs.) On the Line Spectra of the Ele- Nature,' xlvi. 29, 126, ments. (May.) 222, 268. · On the Line Spectra of the Ele- Nature,' xlvi. 100, 200, Das Grenzbrechungsexponent für Wellen. Transformation der Dispersionsgleichungen. (Aug.) 247. 'Ann. Phys. u. Chem.' [N.F.], xlvi. 572-583; Nature,' xlvi. 484 (Abs.) G. J. Stoney. G. Higgs A. Cornu A. Kurz. E. Carvallo . THEORETICAL PAPERS, 1892, 1893. Recent Spectroscopic Determina-Nature,' xlvi. 513. List of the Chief Abbreviations used in the above Catalogue. Full Title. American Journal of Science (Silliman's). Annales Agronomiques. Annalen der Chemie und Pharmacie (Liebig). Annales de Chimie et de Physique. Arch. f. d. gesammte Arch. f. exper. Pathol. u. Arch. néerland. Astr. Nachr. Annales de Chimie. Annuaire de l'Observatoire de Bruxelles. Annalen der Physik und Chemie [Neue Folge] (Wiedemann). Archives des Sciences Physiques et Naturelles (Genève). Archiv für pathologische Anatomie und Physiologie und für klinische Medicin (Virchow). Archiv für die gesammte Physiologie (Pflüger). Archiv für experimentelle Pathologie und Pharmakologie. Archives néerlandaises des Sciences exactes et natu- Atti d. R. Accad. d. Lincei Atti della Reale Accademia dei Lincei. Beiblätter. Beiblätter zu der Annalen der Physik und Chemie (Wiedemann). Bull. Soc. Min. de France Bulletin de la Société Minéralogique de France. C. R. Chemisches Centralblatt. Comptes Rendus de l'Académie des Sciences (Paris). Abbreviated Title. Dingl. J. Gazz. chim. ital. Göttingen. Nachr. List of the Chief Abbreviations-continued. Full Title. Dingler's polytechnisches Journal. Nachrichten von der Georg-August-Universität und der königl. Gesellschaft der Wissenschaften (Göttingen). Handl. Svensk. Vet. Akad. Handlingar K. Svenska Vetenskaps Akademien (Stock Phys. Revue Proc. Phys. Soc. Proc. Roy. Inst. Proc. Roy. Soc.. holm). Jahrbruch für Photographie (Eder). Journal of the Chemical Society of London. Journal de Physique. Journal of Physiology. Journal für praktische Chemie. Journal of the Russian Physico-Chemical Society (in Journal de la Société française de Physique. Mathematische und naturwissenschaftliche Berichte aus Memorie della Società degli spettroscopisti italiani. Monatshefte für Chemie (Wien). Monthly Notices of the Royal Astronomical Society of Oefversigt af K. Svenska Vetenskaps Akademiens London, Edinburgh, and Dublin Philosophical Magazine. Photographische Mittheilungen (Vogel). Physical Review. Physikalische Revue. Procedings of the Physical Society of London. Proceedings of the Royal Institution of Great Britain. Proceedings of the Royal Society of London. Rec. des. trav. chim. des Recueil des travaux chimiques des Pays-Bas. Pays-Bas. Rend. R. Accad. d. Lincei Rendiconti della reale Accademia dei Lincei. Riv. sci. industr. Sitzungsb. Akad. Berl. Sitzungsb. Akad. München Sitzungsb. Akad. Wien Rivista scientifico-industriale. Sitzungsberichte der Akademie der Wissenschaften zu Sitzungsberichte der königlich baierischen Akademie zu Sitzungsberichte der Akademie der Wissenschaften zu Sitzungsb. phys.-med. Soc. Sitzungsberichte der phys.-medicinischen Societät zu Erlangen. Skandinavisches Archiv für Physiologie (Leipzig). Anzeiger der k. Akademie der Wissenschaften zu Wien. Zeitschrift für anorganische Chemie. Zeitschrift für Krystallographie und Mineralogie. Zeitschrift für physikalischen und chemischen Unterricht. Zeitschrift für physiologische Chemie. An International Standard for the Analysis of Iron and Steel.— Sixth Report of the Committee, consisting of Professor W. C. ROBERTS-AUSTEN (Chairman), Sir F. ABEL, Mr. E. RILEY, Mr. J. SPILLER, Professor J. W. LANGLEY, Mr. G. J. SNELUS, Professor TILDEN, and Mr. THOMAS TURNER (Secretary). (Drawn up by the Secretary.) In the previous report of this Committee it was stated that the work of the British analysts was completed, so far as the four original standards were concerned, and that the results of the analyses conducted by the other Committees were in good agreement with those published by this Committee. The remaining standard, No. 5, has now been analysed by Messrs. G. S. Packer, J. Pattinson, E. Riley, and J. E. Stead, and the results of their investigations are as follows: : Generally speaking, the agreement in these results is very good. The carbon determination by Mr. Packer is somewhat high, and this is explained by the fact that Mr. Packer's determinations were made in the laboratory of Messrs. J. Brown and Co., Sheffield; and as the operations. were conducted in the centre of a large works, with dust inevitably in constant circulation, it was not found possible, even by carefully covering the vessels in which the analyses were performed, to obtain strictly concordant results with the combustion of samples so low in carbon content. For this reason, at Mr. Packer's suggestion, his numbers are not reckoned in calculating the mean carbon percentage. The quantity of material operated upon in estimating such small amounts of carbon is necessarily large, and during filtration and other processes in a dusty atmosphere sufficient carbon is added to seriously affect the results. The manganese determinations vary from a minimum of 0.258 to a maximum of 0·317, and the figures have been carefully checked by the analysts. This difference raises an important question as to the relative accuracy of the methods employed, though such inquiries are outside the present work of the Committee. Several applications have been received during the past year for samples of the standards from chemists engaged in investigations as to the relative accuracy of various methods of analysis, and it is hoped, now the standards have been prepared and their composition determined with very considerable accuracy, that they may be frequently employed for such purposes of reference. As the work of the Committee is now completed it is proposed to shortly deposit the standards with the Board of Trade, as originally suggested, or with some other suitable authority, where they will be at the public service. The Committee do not ask for reappointment. The Action of Light upon Dyed Colours.-Report of the Committee, consisting of Professor T. E. THORPE (Chairman), Professor J. J. HUMMEL (Secretary), Dr. W. H. PERKIN, Professor W. J. RUSSELL, Captain W. DE W. ABNEY, Professor W. STROUD, and Professor R. MELDOLA. (Drawn up by the Secretary.) DURING the past year the work of this Committee has been continued, and a large number of wool and silk patterns, dyed with various natural and artificial orange and yellow colouring matters, have been examined with respect to their power of resisting the fading action of light. The general method of preparing the dyed patterns, and the manner of exposing them under glass, with free access of air and moisture, were the same as already adopted. The patterns were exposed at Adel, near Leeds, in the grounds of James A. Hirst, Esq., to whom the best thanks of the Committee are again due for his kind permission to do so. Each dyed pattern was divided into six pieces, one of which was protected from the action of light, while the others were exposed for different periods of time. These 'periods of exposure' were made equivalent to those adopted last year, by exposing, along with the patterns, special series of standards,' dyed with the same colouring matters as were then selected for this purpose. The standards were allowed to fade to the same extent as those which marked off the 'fading period' of last year, before being renewed or removing a set of dyed patterns from the action of light. The patterns exposed during the past year are therefore comparable, in respect of the amount of fading which they have experienced, with the red dyes already reported upon. The patterns were all put out for exposure on June 8, 1893, certain sets being subsequently removed on the following dates :-July 1, July 31, August 26, 1893; February 19, June 12, 1894. Of the five 'periods of exposure' thus marked off, periods 1, 2, 3 were equivalent to each other in fading power, whereas periods 4 and 5 were each equivalent to four of the first period in this respect; hence five patterns of each colour have been submitted respectively to an amount of fading equal to 1, 2, 3, 7, and 11 times that of the first 'fading period' selected-viz. June 8 to July 1, 1893. The dyed and faded patterns have again been entered in pattern-card books in such a manner that they can be readily compared with each other. The following tables give the general result of the exposure experiments made during the year 1893-94, the colours being divided, according to their behaviour towards light, into the following five classes: very fugitive, fugitive, moderately fast, fast, very fast. The initial numbers refer to the order of the patterns in the patternbooks. The S. and J. numbers refer to Schultz and Julius's 'Tabellarische Uebersicht der künstlichen organischen Farbstoffen.' The colours marked thus (*) appear to be somewhat faster than the rest of the class in which they are placed. In the case of colouring matters requiring mordants, the particular mordant employed is indicated in brackets after the name of the dyestuff. |