Report of work done in the division of chemistry and physics, mainly during the fiscal year 1889-90

This bulletin, like the bulletins issued in previous years and numbered 9, 27, 42, 55, 60, and 64, contains a partial record of work completed in the chemical and physical laboratories of the Survey Turing one tiscAl year. It represents, however, only a portion of the whole work done, for various investigations, begun during the year 1859—'90, are still unfinished; many analyses are reserved for publication in other reports; and certain of the larger researches, notably the physical studies of Dr. Barns, will appear in independent form as separate bulletins. In the annual reports of the Director of the Survey a tolerably complete summary of the work done in the Division of Chemistry and Physics is always given, and such summaries, taken in connection with these bulletins, convey.a fair idea of the amount of ground actually covered.