322 Burnett on Organic Relations of Infusoria, ete. 
possess an individuality until it has been fecundated by the 
semen. 
Cartilage, epithelial and other cells, undergo similar pro- 
cesses. Yet they have no individuality of their own, for they 
can play no part in physiology unless attached to the organ- 
isms to which they belong. 
These examples illustrate pretty well the distinction I wish 
to draw between animal organic matter, possessing organizing 
forces, and animal organic matter possessing the individuality 
of life ; and this is no metaphysical distinction, for it really 
exists in nature. On this account, I say, that if in Infuso- 
rial studies, we meet with free, moving particles, and even 
having a motion apparently adaptive, and increasing in num- 
bers, by the endogenous formation of cells, we cannot, from 
these data, say that they are individual beings; on the other . 
hand, in the present state of science, they are rather to be 
regarded as organic particles. 
These remarks are applicable to what I now wish to say 
concerning some investigations I have recently made upon 
the family of Monads (Monadina) of Ehrenberg. As it now 
stands, undoubtedly it includes very heterogeneous elements; 
particles being grouped together from their general aspects; 
rather than from their physiological characteristics. 1 cannot 
pretend to take them up in that systematic way in which 
they have been arranged by Ehrenberg, for I have found but 
little system about them, and, for the most part have been 
unable to follow. his descriptions. If we are to judge of 
them by mere form and size alone, I should say that the 
variety that passes under the eye of the microscopist is end- 
less. Indeed, in watching the same particle, for a long time, 
I have seen it change its form and size four or five times, and 
each as distinct from the other, as many. of Ehrenberg's 
species. Those which contain green coloring matter, OF 
Chlorophyle must, it appears to me, in virtue of that fact, be 
regarded as of a vegetable nature. As to the others this 
point would be doubtful. The tailed Monads, forming the 
