to discover the Ova of Rabbits . 213 
moved from one place to another (after these horns are open- 
ed) by the gentlest breath blown through a blow-pipe. 
The figures marked 5th day, are ova of the fifth day ; still 
loose in utero, and still capable of being blown with the 
gentlest breath from one part to another: they resemble the 
last in every thing, only that they are larger. The three first 
are of the natural size; the three last magnified, as the for- 
mer ova. 
The figures marked 6th day, are ova found in the horns of 
the uterus on that day; sensibly larger than the preceding; not 
adhering, even now, to the internal surface of the uterus, but 
exactly as the last in this respect. The four first are of the 
natural size, the three last magnified as before ; but, as kept 
some years, the amnion has receded from the chorion to a con- 
siderable degree. 
The figures marked 7th day, are ova of the seventh day: the 
first shews the ovum in its cell in the horn of the uterus, laid 
open ; the three next are similar ova, taken out of their cells, 
and resembling the former ; the three last are of the same pe- 
riod, and also removed from the uterus, but magnified by the 
same microscope as the preceding ova. They are seen after 
having been kept many years, and the secession of the amnion 
from the chorion is still more apparent and greater. 
The figures marked 8th day : the first shows the foetus now 
first visible to the naked eye by dropping distilled vinegar on 
it, in one of the cells of the uterus opened. A little above is 
seen a cell turgid and unopened; and below a cell half divided. 
The two next figures, in the same line with the foetus men- 
tioned, are foetuses of the same period from other rabbits. 
