IRON COMPOUNDS IN ANIMAL AND VEGETABLE CELLS. 273 
Fie. 30.—An impregnated ovum of Ascaris mystax, showing the division 
of its nucleus (~.) and the condition of the spermatozoid (sp.). Alcohol, the 
glycerine and sulphide mixture ten days. x 750. 
Fies. 31 and 32.—Spermatozoids of Ascaris mystax. Alcohol, the 
glycerine and sulphide mixture nine days. 31, x 820; 32, x 1640. 
Fics. 88—36.—Ovarian ova of the lake-lizard, Necturus lateralis, 
illustrating differences in the distribution of the “masked” iron. In 35 is 
shown the iron-containing peripheral nucleoli, and @ represents a more highly 
magnified (= x 1240) portion of the nuclear structure. In 386 is seen an 
earlier stage with a, a portion of its nuclear network, more highly magnified 
(x 1240). Alcohol, sulphuric acid alcohol thirty-six hours, glycerine and 
ammonium hydrogen sulphide. x 305. 
Fic. 37.—Retinal rods and cones from a larva of Amblystoma. Alcohol, 
whole of retina in Bunge’s fluid two days, glycerine and ammonium hydrogen 
sulphide. x 620. 
Fic. 88.—Cells from the pancreas of a larva of Amblystoma. Alcohol, 
Bunge’s fluid (on the whole of the organ) two days, glycerine and ammonium 
hydrogen sulphide. x 620. 
Fig. 39.—A portion of a section of the human epidermis, illustrating the 
occurrence of “‘masked”’ (?) iron in the granules (eleidin) of the stratum 
granulosum and in the stratum lucidum. Alcohol, sulphuric acid alcohol two 
days, glycerine and ammonium hydrogen sulphide. x 620. 
Fic. 40.—Strands of fibrils from the muscle fibre of a larva of Ambly- 
stoma. Alcohol, sulphuric acid alcohol two days, glycerine and ammonium 
hydrogen sulphide. x 750. 
Figs. 41 @ and 6.—From the ovary of a specimen of Erythronium ame- 
ricanum; 4 represents an isolated nucleus. Alcohol, sulphuric acid alcohol 
thirty hours, acid ferrocyanide mixture, balsam. x 1240. 
Fie. 42.—A cell from a section of the ovary of the same specimen, with the 
iron demonstrated as in last case, but the preparation, before being mounted 
in balsam, was stained with eosin. x 1240. 
Fies. 43 and 44.@ and 4.—Nuclei of the embryo sac of a specimen of E. 
americanum. Alcohol, sulphuric acid alcohol thirty-six hours, acid ferro- 
cyanide mixture, balsam. x 620. 
Fies. 45 a and 6.—Nuclei from the liver of a specimen of Necturus 
lateralis. z. Nucleoli. Alcohol, sulphuric acid alcohol thirty-six hours, 
acid ferrocyanide mixture, balsam. x 1240. 
Fics. 46 a—d.—Hepatic nuclei treated as in foregoing case, also stained 
with safranin to illustrate the differences between the chromatin network and 
the nucleoli in regard to the effect of this reagent. x 1240, 
Fic. 47.—Two hepatic nuclei treated as in the preparation illustrated by 
