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incide with the possibility of making them, very frequently in the urse of a short time such as that which has elapsed since the cameras ve been finished.

Your Committee, therefore, ask to be reappointed for another year, so at they may carry out the work in hand, and with that object in view k for a further grant of 157.

lar Radiation.-Eleventh Report of the Committee, consisting of Sir G. C. STOKES (Chairman), Professor A. SCHUSTER, Mr. G. JOHNSTONE STONEY, Sir H. E. ROSCOE, Captain W. de W. Abney, Mr. C. CHREE, Mr. G. J. SYMONS, Mr. W. E. WILSON, and Professor H. MCLEOD, appointed to consider the best Methods of Recording the Direct Intensity of Solar Radiation.

HE Committee regret to have to report that for various reasons no xperiments have been made with the Balfour Stewart actinometer since he last meeting of the Association. As Mr. Wilson has undertaken to continue the experiments, the Committee ask for reappointment and for the unexpended balance of the previous grant.

Investigation of the Earthquake and Volcanic Phenomena of Japan.
Fourteenth Report of the Committee, consisting of the Rt. Hon.
Lord KELVIN, Pres. R.S., Professor W. G. ADAMS, F.R.S., Mr. J.
T. BOTTOMLEY, F.R.S., Professor A. H. GREEN, F.R.S., Professor
C. G. KNOTT, F.R.S.E., and Professor JOHN MILNE, F.R.S.
(Secretary). (Drawn up by the Secretary.) ̧

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I. THE GRAY-MILNE SEISMOGRAPH.

THE first of this form of seismograph, constructed in 1883, partly at the expense of the British Association, still continues to be used as the standard instrument at the Central Observatory in Tokio.

I am indebted to Mr. K. Kobayashi, the Director of the Observatory for the following table of its records

:

1895.

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Catalogue of Earthquakes recorded at the Central Meteorological Observatory in Tokio between April 19, 1893, and May 17, 1894

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CATALOGUE OF EARTHQUAKES-continued.

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Remarks.

Shock 1,351.-Commenced very gently for about 36 seconds, when a violent shaking, lasting 16 seconds, took place. It then died out.

Shock 1,352.-This commenced gently for 32 seconds, after which, for 9 seconds, the motion was strong. Then it died out.

Shock 1,366.-Strong motion, lasting 15 seconds, commenced after 9 seconds of preliminary motion.

Shock 1,368.-Was very slow and gentle. After one minute the horizontal motion was marked for about 13 seconds. During 26 seconds it showed nineteen large waves.

Shock 1,376.-At first this was slow, but became stronger after 3 minutes 12 seconds, when for the next 30 seconds it was pronounced.

II. OBSERVATIONS WITH HORIZONTAL PENDULUMS.

In the years 1883, 1884, 1885, 1887, 1888, 1892, and 1893 I embodied in Reports to the Association some account of work which had been carried out in Japan in the investigation of earth tremors or pulsations and earth tilting. The Twelfth Report (1892) describes a pair of extremely light horizontal pendulums the movements of which were recorded on photographic plates or films, and gives some account of the analysis of the resulting records. The observations were continued during the following year, and, as stated in the Thirteenth Report (1893), it was observed that the direction of earth-tilting movement and also of earthquake movement in the majority of cases coincided with the direction in which strata have been folded to form mountain ranges bordering the Tokio plain. Another observation was that certain earthquakes had been preceded by an abnormal amount of tilting.

In consequence of the liberality of the Royal Society of London during the last year I have been enabled to extend these observations, using six horizontal pendulums, each provided with photographic recording apparatus.

The places of observation have been in Tokio, at my house, on a massive stone column, and at a place about 1,000 feet distant in an underground chamber on a concrete bed; at Kanagawa, in an artificial cave driven in a soft tuff rock at a depth of 50 feet below its junction with 50 feet of overlying alluvium; at Yokohama, in a cave driven at the junction of the tuff and alluvium; and at Kamakura, in a cave in the tuff which at this place is hard and dips at an angle of 30° N.E. All these places lie from Tokio on a S.S.E. line, and are respectively 20, 23, and 38 miles distant from my house. At Kanagawa and at my house there is only one instrument, and the booms of these pendulums point N.W. At the other stations two instruments have been or are now being used, and these are placed at right angles to each other, one pointing N.W., or parallel to the strike of the rocks, and the other N.E., or parallel to the dip. At Kamakura observations were made for two and a half months, when the instruments were brought to Yokohama. At this latter place, owing to a series of accidents, one of which was the collapse of the roof of the cave, up to the present the observations have been extremely few. At Kanagawa, although the cave is wet, the observations have been fairly continuous. In Tokio, where I am able to see the instruments every day, but few interruptions have occurred. The chief part of this report, therefore, refers to Kamakura and Tokio.

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