[30] Dr. G. A. Piersoll, “American Annual of Photography,” 1890.
[31] “Journal of the Royal Microscopical Society,” 1892, p. 684.
[32] “Journal of the Royal Microscopical Society,” p. 578, 1897.
[33] Herapath’s test-fluid is a mixture of three drachms of pure acetic acid, one drachm of alcohol, and three drops of sulphuric acid.
[34] “Journal of the Royal Microscopic Society,” 1867.
[35] Born in 1787, at Straubing, a small town in Bavaria.
[36] Dr. Thudicum’s “Tenth Report of the Medical Officer of the Privy Council, 1867.” Mr. Sorby “On Some Improvements in the Spectrum Method of Detecting Blood.” “Journal of the Royal Microscopical Society,” 1871.
[37] “On the Reduction and Oxidation of the Colouring-matter of the Blood” (“Proc. of the Royal Soc.” vol. xiii. p. 355). The oxidising solution is made as follows:—To a solution of proto-sulphate of iron, enough tartaric acid is added to prevent precipitation by alkalies. A small quantity of this solution, made slightly alkaline by ammonia or carbonate of soda, is to be added to the weak solution of blood in water.
[38] “Journal of the Royal Microscopical Society,” 1869.
[39] Professor Sylvanus Thompson, “On the Measurement of Lenses,” “Journal of the Royal Microscopical Society,” 1892, p. 109.