1922. ] ** Renal Portal ’’ System. 17] 
1 
Control Toad 0°542 mm. 0310 mm, 0248 mm. 0°58 
No. 10 
Toad J 0°697 mm. 0:387 mm. 0°387 mm. ae 
(regenerated 0°61 
r.a.v.) 
If we leave out of cioer mare the aberrant ratios = the ** Another 
Normal Control Toad,’’ Toad U and Toads Nos. | and 3 (in the first 
two of which the ante aioe a ‘bdominal is geen wel abnormally small vei in 
the latter two abnormally swollen), the mean maining normal 
contro] toad ratios = =0-63 —® ratio (practically identical with that of J) 
which we may take as bein ng the normal one in res 5 acer a “4 Toad (B 
stomaticus). In other words, in ise per the anterior abdominal is a trifle 
more than three times as large as either of the renal apeeal via found in 
the same toad. 
n the six oe control specimens of R. temporaria, the figures 
were as follow 
(a) (b) (c) 
Frog Ext. Diam. of Ext. Diam. Ext. Diam. (a) 2 x 0°7854 
Ant. Abdom. V. of wr Ren. of Other 
ff. V. Ren. Aff. V. (b)? x 0°7854 

(c) 2 x 0°7854 
1 
Control Frog }-209 mm. 0-821 mm. 0°790 mm. 0°88 
No. | 
é. 
Control Frog 1-224 mm. 0-682 mm. 0899 mm. 0°84 
No. 2 
1 
Control Frog 1:085 mm. 0306 mm. 0-713 mm. 0°98 
0. 3 
as 
Control Frog 1:348 mm. 0°558 mm. 0°527 mm. 0°32 
No. 4 
oe 
Control Frog 1-085 mm. 0-775 mm. 0651 mm. 0°86 
No. 5 
1 
Control Frog 1317 mm. 0-852 mm. 0-806 mm. 0-79 
No. 6 
If we omit the aberrant ratio of No. 4, we shall find that the average 
of the five remaining ratios =9-91 in other words, the anterior abdominal 
is on the average, a trifle more than twice the size of each renal afferent vein 
and is therefore smaller in proportion than the anterior abdominal vein 
of the toads. 
The ratio of the abnormal frog OD = =5 the anterior abdominal 
—— being about equal in size to each renal afferent vein, and therefore 
uch smaller in proportion than the anterior abdominal of normal R. 
rap Te 
Since, in the normal Indian toad and in Rana temporaria, the eaeigmar’ 
abdominal vein is respectively about 3 times and 2 times, as large as each 
