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The day following an exchange of the chronographic record of time and exchangesignals, said signals will be carefully copied into a record-book, which, like all other records, must be made in duplicate.

It is intended that computations in the field shall be carried on to such an extent as circumstances may permit.

The time that can be allotted to each of these stations, in order to accomplish the expected results for the season, is from twenty to twenty-five nights; and as observations are required only for eleven nights, the remaining interval should be employed in computation.

The order of sequence for an astronomical report is furnished herewith, and the records and journal will be so kept as to comprise all the data necessary for the full expression of results in accordance therewith.

Official:

GEO. M. WHEELER,

First Lieutenant Corps of Engineers, in charge.