436 proceedings of the academy of [may, 



Bibliography, 



Erdmann, Rh. 1910. Die Entwicklung der Sarcocystis muris in der Musku- 



latur. [Read 8. Nov.] < Sitzungsb. d. Gesellsch. naturf . Fr. zu Bed. 



(9), Nov., pp. 377-387, figs. A-E, Pis. 18, 19, figs. 1-14. 

 MiNCHiN, Edward Alfred. 1903. Protozoa. TheSporozoa. (/n ; A treatise 



on zoology, edited by E. Ray Lankester. 8°. London. Part 1, fasc. 2, 



pp. 150-360, figs. 1-127.) 

 1912. An introduction to the study of the Protozoa, with special reference 



to the parasitic forms, xi + 517 pp., 194 figs. 8°. London. 



Explanation of Plate XV. 



The figures were in all cases made by the author from camera outlines, and 

 later copied in ink by Mr. Haines, artist of the Bureau of Animal Industry. 

 The optical system consisted of a 2-mm. apochromatic objective and No. 18 

 compensating eyepiece, yielding a magnification of about 3,530 diameters. In 

 reproduction the drawings have been reduced in the ratio of 3 to 2, and hence 

 are about 2,350 times larger than the actual object. 



Fig. 1. — Shortened spore free in the lumen of the intestine. Two to two and 



one-half hour period. Giemsa stain. 

 Fig. 2. — Spores in the cylinder cells of the host. Two to two and one-half hour 



period. Giemsa stain. 

 Fig. 3. — Spore in a cylinder cell of the host. Two to two and one-half hour 



period. Wright's stain. 

 Fig. 4. — Form from which the males are supposed to arise. Taken from a 



nine-hour period. Delafield's hsematoxylin and eosin. 

 Fig. 5. — Supposed early male stage. Nine-hour period. Iron hsematoxylin 



and acid fuchsin. 

 Fig. 6. — Supposed early female stage. Nine-hour period. Iron hsematoxylin 



and acid fuchsin. 

 Fig. 7. — Microgametocyte with granular nuclei. Eighteen-hour period. 



Wright's stain. 

 Fig. 8. — Microgametocyte with solid nuclei. Taken from a mouse killed nine 



hours after feeding, in which this stage is very rare. Iron hiematoxylin 



and acid fuchsin. 

 Fig. 9. — Microgametocyte in which the microgametes are fully ripe. Eighteen- 

 hour period. Wright's stain. 

 Fig. 10. — Macrogamete. Seventeen-hour period. Iron ha?matoxylin and acid 



fuchsin. Stages such as this are more commonly found in the subepithelial 



spaces than in the cells themselves. 

 Fig. 11. — Macrogamete. Eighteen-hour period. Wright's stain. 

 Fig. 12. — Supposed fertilization. Eighteen-hour period. W^right's stain. Para- 

 sites showing the supposed fertilization were not found in the cells themselves, 



but in the spaces beneath the epithelium. 



