438 PHILOSOPHICAL TRANSACTIONS. [aNNO I678. 



culars, observed, that the right testicle or ovary was but small, white, and its 

 vesicles in a manner dried up. But the left swelled to a vast bulk : the afore- 

 said bladders, in one of which were contained so many pounds of liquor, being 

 nothing else originally but the ova belonging to this left ovary. Imagine you saw 

 about 40 bladders, some of a small pig, others of a hog, or a calf, and some of 

 an ox, all distended with liquor, and tied like a reeve of onions together, and 

 you have the appearance of this ovary. — ^The testicle or ovary itself, all the 

 serum being exhausted, weighed together with the womb, which was but light, 

 25 pounds. Out of all the said vesicles or bladders together, were exhausted 

 above 112 pounds of serum. 



Microscopical Observations on the Structure of Teeth and other Bones, also of Hair. 

 By Mr. Antony Leuwenhoeck. N° 140, p. 1002. 



Having some time since applied a glass, esteemed a good one, to observe the 

 structure of the teeth and other bones ; they then seemed to consist of globules. 

 But since then having drawn out one of my teeth, and for further observation 

 applied better glasses than the former; it has plainly appeared that the whole 

 tooth was made up of very small, straight and transparent pipes. Six or 700 

 of these pipes put together exceed not the thickness of one hair of a man's 

 beard. In the teeth of a cow, the same pipes appear somewhat larger, and in 

 those of a haddock somewhat less. 



I have also observed part of the shin-bone of a calf, 6 or 8 weeks old ; in 

 which the pipes are less straight than in a tooth ; and sometimes there seemed 

 to be several lesser pipes joined together, so as to constitute a larger one. 



Of the Grain of Ivory. 



The author of these Observations has often taken notice of the grain of ivory ; 

 and is that which upon a due position to the falling light is visible to a naked 

 eye. The several pieces whereof it is composed, appearing like the fibres or 

 threads of a muscle, running in parcels, decussatim, and under and over each 

 other reciprocally; and so making up one piece of platted work. 



I have formerly also with others examined the structure of hair ; and we 

 agreed that it consisted wholly of globules ; as also the hoof of an elk. But 

 not being satisfied without further inquiry ; I took the hair of my beard after 

 it had been shaved the first, second, third, and fourth days, and observed, 

 that the little particles which we saw through the common microscopes, which 

 yet were very good, and which appeared round, were indeed irregular, and lay 

 very closely pressed one upon another. Of these particles consist the outer 

 parts or cuticle of the hair. One of these hairs I met with, which seemed rare. 



