O72 A. B. MACALLUM. 
Fic. 7.—Spores of Aspergillus glaucus, a, in the unripe, 4, in the ripe 
condition. Alcohol, the glycerine and sulphide mixture three days. x 1640. 
Fic. 8.—Cells, heterocyst (4.), and spore (sp.) of Cylindrospermum 
majus. Alcohol, the glycerine and sulphide mixture fourteen days. x 1640. 
Fic. 9.—Three cells of a filament of Microcoleus terrestris. Alcohol, 
the glycerine and sulphide mixture four days. x 2000. 
Fic. 10.—a. Spores (immature), 4, c, and d, basidia of a leucosporous 
Hymenomycete. d. Basidium with sterigmata and one attached spore. 
Sterile (?) element in &. Alcohol, the glycerine and sulphide mixture eight 
days. xX 820. 
Fies. 11—13.—Portions of hyphe of Hyphelia terrestris Fries, 
illustrating the development of the fructification, 13 a and representing the 
simplest form. Alcohol, the glycerine and sulphide mixture three days. 
x 820. 
Fries. 14—18.—From the ovary of a specimen of Erythronium ameri- 
canum hardened in alcohol. Fig. 14 illustrates the effect produced by diam- 
monium sulphide and glycerine in two days; Figs. 15, 17, and 18 represent 
that produced by ammonium hydrogen sulphide and glycerine in the same 
time; and in Fig. 16 is shown how intense the reaction appeared after treat- 
ment for four days with the same reagent. x 1240. 
Fies. 19—22.—From the ovary of a specimen of Erythronium ameri- 
canum hardened in alcohol. Sections treated for thirty hours with sulphuric 
acid alcohol, and mounted in a mixture of glycerine and ammonium hydrogen 
sulphide. xX 1240. 
Fic. 23.—Four hepatic cells from a specimen of Necturus lateralis. 
Alcohol, the glycerine and sulphide mixture eight days. x 620. 
Fic. 24.—Two hepatic cells from the same animal, illustrating the distri- 
bution of the iron and the nuclear structure after they were treated with sul- 
phuric acid alcohol for twenty-four hours, and mounted in a mixture of 
elycerine and ammonium hydrogen sulphide. x 620. 
Fic. 25.—An example of Stentor polymorphus. Alcohol, the glycerine 
and sulphide mixture two weeks. X 305. 
Fic. 26.—An example of Stentor polymorphus. Alcohol, Bunge’s 
fluid thirty-seven hours, ammonium hydrogen sulphide and glycerine. x 305. 
Fic. 27.—Examples of Vorticella sp. Alcohol, the glycerine and 
sulphide mixture seven days. x 600. 
Fic. 28.—An example of Epistylis sp. Alcohol, Bunge’s fluid twenty- 
four hours, glycerine and ammonium hydrogen sulphide. x 600. 
Fic. 29.—An ovum of Ascaris mystax, fixed during impregnation. Only 
a portion of the ovum is represented. Alcohol, the glycerine and sulphide 
mixture eight days. x 820. 
