VOL. LXXXVII.] PHILOSOPHICAL TRANSACTIONS. 135 



many in the tubes; I got about 6; others were lost, from the great difficulty in 

 slitting up the fallopian tubes without bruising the ova with the fingers or with the 

 point of scissars; there were 8 or 9 corpora lutea in one ovarium, and 2 only in 

 the other; on the side of the 2 1 only found 1 ovum, but twice as large as those on 

 the other side. I observed that the redness of the uterus, depended on not losing 

 much of the animal's blood; for when they had been so kiiled that much blood was 

 lost, the fallopian tubes at least and ovaria were always pale. 



Exper. 15. Opened another rabbit at 24. days after the coitus: ovaria impreg- 

 nated, but found no ova in the tubes, nor orifices in the corpora lutea. 



Exper. 16. Opened one, 3d day complete: found about 6 or 7 ova in the fal- 

 lopian tubes, near their end, or about an inch within the tube, on the side next 

 the uterus: in the microscope the ovum appeared as having 3 coats; the middle one 

 perhaps becomes allantois or membrana quarta. 



Exper. 27. Opened again another at 24- days: and though there were a great 

 many corpora lutea, I could not discover any ova; they were probably too small to 

 be perceived, for on the 3d day complete some of the ova were not perceptible, till 

 they were put into a fluid, and viewed in the microscope. 



Exper. 28. Opened 1 on the 3d day all but 2 hours: found six ova in 1 fallopian 

 tube, and 7 in the other, which corresponded exactly to the number of corpora 

 lutea in each ovarium ; the ova had 3 membranes as before. The circles in the 

 cicatricula of the hen's egg are perhaps similar to these. The ova seems 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 2 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. 



Exper. 29. I opened another at 84- days : every thing more distinct and more ad- 

 vanced than on the 8th day; the heart now visible, and resembling much the ap- 

 pearance of the incubated egg in the 48th hour. There were 7 corpora lutea in 

 the right ovarium, and but 4 ova in the right horn of the uterus; there were also 

 3 in the left ovarium, though but 2 ova in the left horn. 



General conclusions. — 1st. 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 1 ovum only in the 

 fallopian tube. I saw 13 in one instance, 5 in another, 7 in another, and 3 in 

 another, in all 28. 5thly. The ovum comes into the uterus on the 4th day. 

 6thly. De Graaf did not see the foetus till the 10th day; I saw it on the 8th. 

 7thly. These experiments explain what is seen in the human female. For, 



a. I show a child, at lectures, which remained in the ovaria till it was the size 

 of the 5 th month ; its fluids were all wasted, and its solids were hard and com- 

 pressed into an oval form ; it had the chorion and amnion, its chord and placenta. 



b. I also have in my possession the uterus and ovaria of a young woman who 



