PRODUCED BY BODIES ACTING BY CONTACT, 13 
with these; and, in fact, when considering their generation and 
their development, we cannot draw any other conclusion. They 
always begin by forming in the fermentable juices of plants be- 
fore fermentation takes place in them. 
It is not till after three days that we remark, in these liquids, 
microscopic points isolated or united into strings; these points 
are developed, and it is easily observable that their increase takes 
place from within outwardly ; at last we remark in their interior 
a granular mass surrounded by a transparent covering. They 
are often elongated, and they then contain two or three granular 
particles. 
In employing perfect globules of yeast to excite the fermenta- 
tion of sugar, I have not remarked that they developed them- 
selves; but on leaving the yeast standing for some time, they 
are seen to ramify in the manner of Conferve. The organized 
substances which are formed in whey present verticillated rami- 
fications. The deposits which take place in whey at the end of 
a few days, as well the yeasts, are organized, but they are very 
often mixed with an unorganized substance. According to the 
experiments of several naturalists, of MM. Schultz, Schwann 
and others, these substances are not produced when the access 
of air is intercepted, or when to the matters susceptible of being 
converted into ferment, there is only admitted air which has pre- 
viously been raised to a red heat. ‘This fact would be a proof 
against equivocal generation ; whilst, supposing that the origin of 
an organized body in a liquid proceeds from a point which escapes 
observation, it would tend, on the contrary, to induce us to ad- 
mit this mode of generation. , 
It would be important to know what these bodies would be- 
come, if, instead of being developed in the midst of a liquid, 
their development took place im the open air. Would a fungus 
be the result, as M. Kiitzing thinks? A fungoid plant added to 
a fermentable liquid does not induce fermentation, and humid 
ferment exposed to the air for a long time is not converted into 
mould, 
_ The presence of these organized bodies in the intestinal tube 
of the Herbivore is particularly interesting: it is easy to be con- 
vinced by M. Trommer’s test of the presence of grape sugar. 
in an animal which has eaten vegetable matter. It is found in 
the stomach and in the intestinal canal, as far as the rectum only, 
We meet with the organized bodies which we are considering in 
