ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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protoplasm (daughter-cysts), and these latter aro set free hy rupture 
of the investing membrane of the mother-cyst. 
The parasites were present in enormous numbers, as many as 70 
being counted in one field of the Microscope (Zeiss apo. 8 mm. oc. 4), 
and they could be seen without any special preparation whatever, 
though they were easily stainable by the anilin pigments, of which 
vesuvin-glycerin was the best. 
Coccidiosis of Rabbits.* — Dr. R. Pfeiffer claims to be the first to 
have discovered the fact that the coccidia of rabbits multiply by means 
of “ swarming cysts ” as well as from spores and falciform germs. It is 
in young rabbits that proliferation by swarming cysts is the more 
common, and it consists in the direct fracture of many falciform bodies 
from a ripe coccidium, and this without being preceded by the develop- 
ment of a definite number of spores, each of which, in its turn, produces 
a definite number of falciform bodies. 
The author portrays the “ exogenous sporulation ” of Coccidium 
oviforme , a phase well known from the researches of other authors. By 
this he understands a proliferation taking place outside the body of the 
host in which spore-formation occurs within cysts (L. Pfeiffer’s resting- 
cysts). By “ endogenous sporulation ” is meant the same thing that L. 
Pfeiffer has called the “ swarming cyst.” 
Experiments to prove the connection between the two forms of 
sporulation, by feeding young rabbits with ripe exogenous sporocysts, 
failed. 
* ‘Beitrage zur Protozoen-Forschung,’ part i., Berlin, 1892, 24 pp., 12 photo- 
micrographs. See Centralbl. f. Bakteriol. u. Parasitenk., xii. (1892) pp. 733-5. 
