86 Journal of the Asiatic Society of Bengal. [N.S., XVIII, 
PART I 
On THE Two Systems OF SINUSOIDS IN THE 
Froe’s KIDNEY. 
Introduction. 
There exist two well-known examples of organs being 
supplied by a vein in addition to an artery, viz. the hepatic 
portal vein supplying the liver, and the so-called ‘‘ renal por- 
tal”’ vein “supplying” the kidney of the majority of the 
lower vertebrates. Since the former is known to be all- 
important in connection with the hepatic function, it has not 
unnaturally been assumed by physiologists that the so-called 
“renal portal’? vein must at least play some part in connec- 
tion with the renal secretion. On the basis of this assumption. 
physiologists have further assumed that the “renal portal ” 
vein joins on to and forms an important part of the inter- 
tubular plexus system of vessels present in the kidneys of 
lower vertebrata—the only system of vessels the vein could 
join. 
active hot-blooded Amniotes ; that (2) “ portal” kidneys are 
not larger in size than non-portal kidneys (well seen when 
kidneys of both kinds co-exist in the same individual), though ~ 
the former Teceive, on the “ portal” hypothesis, at least four 
times (Indian frog—see Appendix A) as much blood as the 
latter; that (3) of the venous blood returned from the legs and 
- . 
pelvic region, from one-third to one-half evades the passage 
! All literature references will be given at the end of Part IV. 
ip tae Ais Vee Rect Tea ene Y= Oe cies 
each aiiecitied ieee eemideadtnes tite akceneee tee 

