160 
ON THE PRODUCTION OF ANIMALCULE 
Second Species. — Form elongated and a little flattened; head distinct; 
carapace granulated ; body provided with four extremities articulated upon 
the lateral parts, of which two are anterior and two posterior ; a crown of 
vibratile cilia at the posterior part of the body ; movements slow ; length 
jLth, diameter ^ 0 th of an inch. 
Third Species. — Form, ovoid ; carapace, granular ; a tuft of cilia at the 
anterior, posterior, and lateral parts of the body ; movements slow ; length 
75 ! oth, diameter y^th of an inch. 
Fourth Species. — Body elongated with cilia upon the whole of its surface ; 
movements slow ; length yJggth, diameter TI x soth of an inch. 
Fifth Species. — Form, spheroidal; whole body covered with cilia ; move- 
ments lively and rotatory; diameter ^th of an inch. 
Sixth Species. — This animalcule has some resemblance to the form of the 
turtle ; carapace flattened, and bearing three slopes, two of which are fur- 
nished with tufts formed by large cilia ; diameter ^gth of an inch. 
Seventh Species. — Monad ; ^ 5 th an inch ? the alimentary matters, more 
or less hard and moulded, contained in the last portion of the colon and in 
the rectum, offered only the carapaces of all these animalcules. 
3c?. — The dog has in its stomach two species of monads : — 
First Species. — Body pyriform, terminated by a little tail ; movements very 
lively ; length y^th, diameter ^th of an inch. 
Second Species. — Body pyriform; movements executed forwards and back- 
wards with slowness ; length ^gth of an inch. 
The duodenum and the anterior third of the middle portion of 
the small intestine contain these monads ; but the last third, the 
csecum, colon, and rectum, did not offer any. 
4 th . — The hog had only one species of animalcule in its 
stomach : the form is oval and flattened ; the posterior part ter- 
minated in a conical tail; movements very lively; length -r/ootli, 
diameter T , °f an inch. 
5th . — These animalcules of digestion are generated, live, and 
swim in the acid liquid of the stomach ; and, by placing it in a 
glass tube and kept constantly at a temperature of 86° to 95° Fah., 
they may be preserved alive for two or three hours. 
6 th . — The great number of these animalcules in the first two 
stomachs of ruminants, the presence of their carapaces in the third 
and fourth, and in the excrementitial matters ; the number equally 
considerable in the csecum and colon of the horse, as also the ex- 
istence of the carapaces in the transverse colon and rectum, induce 
the conclusion that the organic matter of these animalcules is di- 
gested by the rennet of the ruminants ; that it is absorbed in the 
colon of the horse ; and that in the one as in the other viscus it 
gives an animal matter for digestion. 
1th . — The consequence of this fact is, that herbivorous animals, 
as the sheep and the horse, take into their stomachs, in their na- 
tural state, vegetable matters, the fifth part of which is destined to 
give birth to, and to keep alive, a large number of animals of 
