210 Mr. Cruikshank’s Experiments 
ponded exactly to the number of corpora lutea in each ovarium; 
the ova had three membranes as before. The circles in the ci- 
catricula of the hen's egg are perhaps similar to these. The 
ova seem to enlarge in their way down the tube, as a pea 
swells in the ground before it begins to take root; even in the 
uterus, for two days, they are either loose and unconnected by 
vessels, or the vessels are so small as not to be discovered by 
the microscope. The corpora lutea were flatter on the head than 
I had ever seen them before. 
EXPERIMENT XXIX. 
I opened another at eight days and a half: every thing more 
distinct and more advanced than on the eighth day; the heart 
now visible, and resembling much the appearance of the incu- 
bated egg in the forty-eighth hour. There were seven corpora 
lutea in the right ovarium, and but four ova in the right horn of 
the uterus ; there were also three in the left ovarium, though 
but two ova in the left horn. 
GENERAL CONCLUSIONS. 
ist. The ovum is formed in, and comes out of the ovarium 
after conception. 
2dly. It passes down the fallopian tube, and is some days in 
coming through it. 
3dly. It is sometimes detained in the fallopian tube, and pre- 
vented from getting into the uterus. 
4thly. De Graaf saw one ovum only in the fallopian tube, 
“ in oviductus dextri medio unum !” I saw thirteen in one in- 
stance, five in another, seven in another, and three in another, 
in all twenty-eight. 
