VOL. IV.] PHILOSOPHICAL TRANSACTIONS. 3pt 



by me to many of this honourable company, several years ago, concerning most 

 if not all parenchymous parts, which was inserted in Number 18 of the Phil. 

 Trans, since which time I have made several experiments of the same kind, 

 about the testes, the pancreas, &c. and as far as I have examined them, I find 

 them to be only a texture of fine tubes or ducts, with more or less liquor, with- 

 out any other substance. 



But perceiving the testes of several animals to be variously composed and in- 

 terwoven ; I proceeded ad testiculos tauri, which I have dissected and ordered 

 several ways ; some boiled, others broiled, others infused in spirit of wine, hot 

 and cold, &c. and upon the best examination I can make, I cannot see any of 

 this intermediate substance, or indeed any thing else, that is not vessel or 

 liquor. 



Now in obedience to your commands, I have added another experiment, and 

 that is testiculi humani, hoping to prove it clearly, and perhaps to put it out of 

 dispute, that it is nothing else but a congeries of vessels of various sorts, and 

 their several liquors ; and that there is no such thing as an intermediate sub- 

 stance; and to demonstrate this, I think, it will evidently appear to the bare 

 eye, by what I have here expanded,* which is the true genuine substance of the 

 testiculi humani, I mean the body of it, after the tunica albuginea is removed, 

 without any addition or diminution, excepting only what liquors are dried up 

 during the time of the expansion, which could not be prevented in making such 

 a scheme of it as this is. And this is continued from one end to the other of 

 the glass, on which you see it exhibited in several places without breaking ; 

 which breaking yet does not at all prejudice the truth of this experiment. And 

 although I had not time to open every part, which you see to be like that sub- 

 stance, yet I can order it so, as to show with ease, that that also is nothing but 

 a congeries of vessels, as aforesaid, not yet opened. 



And if it should be objected, that this may be drawn out into seeming vessels, 

 which yet may not be really such ; I answer, that these vessels have the same 

 appearance in the body of the testis, as to denote them such, before they are 

 drawn out ; and in the extension it does sometimes so happen, that one of them 

 will extend easily near half a yard long, before it breaks, though so exceeding 

 delicate and tender, as you may imagine : and when it is thus extended, it has 

 a kind of resemblance to the corrugations of the epididymis, and keeps the same 

 figure and magnitude in the whole extent of them, as to the sight, unless they 

 begin to dry, and then you may see them lose their gyrations upon stretching : 

 as you may see of both sorts on the glass above mentioned. 



* See fig. 1, pi. 10. which represents only the 4th or 5th part of what was exhibited of the same 

 testis after the same manner with this on glass. 



