NATURAL HISTORY. 45 
remainder of the group there represented is the 
result of such an experiment, and are all am- 
plified to the same degree as the parent. 
The infant animalcules present a similar ap- 
pearance under the microscope to the prema- 
ture young shewn in the engraving. At this 
period, their serpentine motions among each 
other, and their transparency, are the only 
characters exhibited. As they advance in 
growth, the alimentary canal becomes apparent, 
and then the embryo young, coiled around it 
within the animal, as shewn in the engraving. 
They are very prolific, as upwards of one hun- 
dred young ones may be counted in a single 
individual. 
These animalcules may be procured at any 
season of the year, and will afford us a constant 
source of amusement. The little trouble and 
attention required for their preservation ren- 
der them highly valuable as microscopic ob- 
jects, all that is necessary for their support 
being a little fresh thick paste about once a 
month. 
The paste proper for procuring these animal- 
cules is made with flour and water only—that 
of the shops, containing resin and other mat- 
ters, is unfit for the purpose. It must be made 
