392 PHILOSOPHICAL TRANSACTIONS. [aNNO l66g. 



And that the greatest part of these vessels are arteries, or other vessels, that 

 immediately receive liquors from them ; I may prove, I think, from another ex- 

 periment made by injection into a part of the arteria prseparans, before I began 

 to expand the body of the testis ; whereupon opening the part, which I saw 

 discoloured, I found, that many of these tubes had received some of the fine 

 particles of that matter with which I tinged my injected spirit. 



And to prevent another objection that might arise, viz. That these particles 

 might possibly change their colour only outwardly ; I used other endeavours to 

 assure myself that the said particles were indeed included within the cavities of 

 these tubes. In the doing of which, I moistened those two tubes with spirit 

 of wine, to see whether that would remove or alter those' particles; but finding 

 no such thing, I pricked and opened with a fine needle part of the containing 

 tube ; whereupon I saw issue forth several of those liquid particles before men- 

 tioned : which assures me farther that this is a mere scheme or congeries of 

 vessels.* 



I have made several other experiments of this kind, about other parts of the 

 body ; not to mention the muscles, heart and kidneys, because I suppose that 

 few men will now contend for a parenchyma in them. And as I have oppor- 

 tunity, I shall show, I hope, that all sorts of glands (so called) are nothing else 

 but vessels (and their liquors) variously wrought, and receptacles of several 

 liquors for divers uses ; the difference of which alters their colour, consistence, 

 &c. My meaning is, that there is in no reputed gland any other thing than there 

 is in the body of the testis, viz. that it has not this or that intermediate sub- 

 stance, but that the liquors regularly come and go to and through them in fine 

 tubes (in such and such heaps and figures, as may make them appear so and so 

 formed in several parts of the body, where they are situated ;) as also, that the 

 more conspicuous vessels of the body have other vessels, that help to make up 

 their coats, and serve for the nourishment of the same, besides such as im- 

 port or export those liquors, for the conveyance of which they were designed 

 for common use. 



So far Dr. King : as to Dr. de GraefF, we shall deliver what he lately impart- 

 ed to us upon this subject, in his own words, extracted out of his letter, dated 

 Delft, July 25, 1669, accompanied cum testiculo gliris dissoluto, et transmisso 

 in spiritu vini ; represented in fig. 2, pi. 10. 



Quod Clar. D. Clarck ait, se parenchyma (quod succum quendam denotare 

 dicit afFusum vel efFusum et aliquomodo concretum in vasculorum et fibrillarum 



* Had the art of injecting with quicksilver been then known, the fullest demonstration would 

 have been obtained, that these vessels (concerning which there was so much controversy among 

 anatomists at the period here mentioned) are real tubes in which the seminal liquor is secreted. 



