392 The Arteriole Recte of the Mammalian Kidney 
which arise directly from the renal vessels, but concede the presence of 
straight medullary vessels which have their origin in the efferent 
branches of the glomeruli situated in the deeper layers of the cortex and 
known as the arteriole recte spurize. Golubew, whose very careful work 
has justly received merited consideration, describes and figures both 
arteriole recte vere and spuriw. A study of the diagrams of the renal 
circulation as found in the recent text-books of Anatomy and Histology 
warrants the conclusion that the majority of the present day writers be- 
lieve in the double origin of the arteriole recte, namely in part directly 
from the renal vessels, for the remainder, from the efferent branches of 
glomeruli. 
Of the various methods that have been used in the study of the arteriolie 
rect, the injection methods in one form or another are given preference. 
Golubew used colored gelatin masses injected through either the renal 
artery or vein, but more particularly a solution of silver nitrate which 
was injected into the vessels after these had been thoroughly washed out 
with distilled water. The silver nitrate was injected under low pressure 
and the injection interrupted as soon as reduction of silver was evident 
in the capsule of the kidney, after which the vessels were again washed 
out with distilled water, the organ divided into pieces, placed in alcohol 
and exposed to light. Free hand sections, dehydrated and cleared in 9il 
of cloves and mounted in damar were used for study. Corrosion prepara- 
tions of the renal vessels obtained mainly with the celloidin method have 
enabled Brédel * and others who have confirmed him to extend our knowl- 
edge of the genera! distribution, relations, and manner of termination of 
the renal vessels. The results thus obtained have also been confirmed in 
Roentgen photographs taken after suitable injection of the renal vessels. 
Particular attention was, however, not given to the arteriole recte bv 
these observers. 
The observations here briefly to be recorded were made on a series of cor- 
rosion preparations of the renal vessels of the dog, cat, rabbit, rat, and 
guinea pig made after a method which is a modification of one suggested by 
Krassuskaja.® 
This observer recommended an injection mass consisting of photoxylin 
(or celloidin), camphor and acetone, colored by the addition of pigments 
rubbed up in acetone. (For a red color, cinnabar is suggested; for a blue, 
Berlin blue; a yellow, chrome yellow; a black, asphalt.) The mass may be 
*Max Brodel: The Intrinsic Blood-Vessels of the Kidney and Their Sig- 
nificance in the Nephrotomy. Proc. Ass. Amer. Anat., 1901. 
°* A. Krassuskaja, as reviewed by Stieda in Ergeb. Anat. u. Entwickl., Bd. 
XE 1903; pl 521, 
