Hydrometer. =No. 1 in Pph. vol. 173
No. 1 in *5991.60=No. 3 in *«G.377.7 United States. Treasury department.
Reports from the Secretary of the Treasury, of scientific investigations in relation to sugar and hydrometers, made under the superintendence of A. D. Bache, by Re Se McCulloh. Revised edi- tion.
Washington. 1848. viii, 653 pp. [30th Congress. lst session. Senate. Ex. doc., no. 50.) 8°,