666 PHrLOSOPHICAL TRANSACTIONS. [anNO 1683. 



foetus, though no larger than a green pea, yet is furnished with all its parts. 

 I have often endeavoured to discover the animal coming out of the male seed in 

 the egg of the hen, but have been unsuccessful, though some of the globules of 

 the egg were magnified to the size of common apples. This disappointment 

 has put me on the eggs of insects, as the flea and louse, which being very 

 small, may be so much the fitter for this discovery. 



The first frog which I anatomised lay on the ground in my way, and seemed 

 so weak through cold that though I kicked it with my foot it would not leap 

 away ; this proved a female, in the guts of which I found worms like those in 

 children, of about the thickness of a hair of my head. The blood consisted of 

 flat oval particles, swimming in a clear liquor; these had no colour as they lay 

 singly, but when two of them lay upon each other, as here fig. 13, their colour 

 was stronger. A is an oval of blood partly covered with B a second oval of 

 blood; C is a third oval of blood, covering a part of ACB as at D, and cast- 

 ing a deeper colour, because 3 plates lie over each other; but there was another 

 small oval hard by, represented by E, which showed of a higher red than the 3 

 plates together. Many of these oval particles were very pleasant to look upon, 

 especially when the moisture wherein they swam, having also globules on the 

 surface as large as i of a blood globule, was evaporated ; for some had in the 

 middle a faint oval shade ; others appeared as if they were made of several ovals 

 of unequal sizes; others seemed to be set round with small globules; others had 

 no globules in the circumference, but several in the middle; these globules, I 

 believe, were at first swimming in the watery liquor under the ovals, though 

 now they cleave to them by accident. 



On the plate whereon I laid the frog that I anatomized, I found several ani- 

 mals moving in a watery blood; they were about half as long and half as broad 

 as the oval particles, and about 50 of them might lie in the space of a sand. 

 These I had never seen in the pure blood, nor could I perceive them in the 

 water that came out on reaping the skin from the flesh, or on opening the belly, 

 or squeezing the head of the frog to make it lie quiet on the plate. At length 

 in the month of June I met with some frogs, whose excrement was full of an 

 innumerable company of living creatures, of different sorts and sizes, the 

 largest kind were shaped like fig. F, and of these I judged that 40 might be in 

 the space of a sand. The second sort had the shape of fig. G, which were but 

 few in number. The third sort was like our river eels, as fig. H, and these 

 were more in number than the first, but the whole excrement besides was so 

 full of living things, that it seemed all to move, and I guessed there was not 

 less than 1000 of the third sort in the space of a sand. From hence I con- 

 cluded that the animals found among the blood might come from my cutting a 



