G. Carl Huber 395 
to dry or it may be studied in water. I have found it advantageous to mount 
in balsam the parts to be studied particularly. If this is desired, the thor- 
oughly cleansed corrosions are placed in distilled water for several hours, 
are then dehydrated in absolute alcohol, transferred to xylol and mounted in 
balsam, the cover glass being supported by fragments of glass of the re- 
quired thickness. These preparations should be viewed with a binocular mi- 
croscope giving stereoscopic vision. 
This method has proven very satisfactory in the study of the renal 
vessels, as it has often been possible to obtain corrosions in which the 
course of the vessels could be readily followed through their several di- 
visions until the capillaries are reached. In such preparations, a con- 
fusion of arterial and venous branches is not possible. The method en- 
ables a definite solution of the course and divisions of the major branches 
of the renal artery, of the radiate cortical branches (arteriw interlobu- 
lares), of the origin of the afferent branches to the glomeruli and of the 
fate of the efferent glomerular branches. It is the purpose at this time 
to consider primarily the arteriole recte and other efferent glomerular 
branches; a fuller consideration of the renal vessels, both arterial and 
venous, is reserved for further contribution. 
As is well known, the renal artery, on entering the hilus of the kidney, 
divides into branches which, after division, course in the peripheral part 
of the pyramid near the junction of the medullary and cortical portions. 
(This statement has reference to the kidneys particularly studied, namely, 
those with a single pyramid.) These major branches, which in their 
course undergo several subdivisions, have a direction which is in the main 
parallel to the surface of the kidney; they describe, therefore, ares with 
convexity outward, and constitute the arterial branches designated as 
arcuate arteries (arterie arciformes). From the convex side of these 
arcuate arteries, there arise at intervals of 2 to 5 mm. branches which very 
generally form an acute angle with the arcuate artery and pass with 
slight inclination toward the cortex. he length of these branches varies, 
and from their outer side, that toward the cortex, there arise short 
branches at relatively close intervals which pass toward the periphery 
of the kidney and very generally subdivide into several branches from 
which arise the so-called interlobular arteries (arterixe interlobulares). 
The arcuate arteries ultimately terminate in smaller branches which also 
give origin to interlobular arteries. Golubew simply states that from the 
convex side of these arches (arteriz arcuate), as also from the terminal 
divisions, arise the interlobular arteries. Von Ebner® after mentioning 
>In Kelliker’s Handbuch, Vol. III, Pt. 1, page 369. 
