506 
REVIEW. 
comes off by rubbing from the escutcheon is indicative of the 
quality of the milk! Nothing has proved it so to us; though 
we may observe that Nature may possibly direct to the 
udder such ingredients of the blood as are proper for the pro- 
duction of milk, the same as, it has been said, she concentrates 
within the renal arteries the elements of urine ; whence it 
follows, that such parts of the skin as are nourished by the blood 
brought for the secretion of milk, might possibly exhale some 
product having an analogy to milk, and so might exhibit the 
qualities of such fluid. 
We have no particular explanation to offer in respect to the 
male. We shall only remark, that the smallness of the hairs 
of the bull is the consequence of the arteries running to the 
scrotal regions being, with the exception of those supplying the 
testicles, which do not extend to the skin, exceedingly small. 
Whatever may be thought of this explanation, which is far 
from being in opposition to the anatomical researches with 
which we set out, the inferences we have deduced from it are 
legitimate ones. It accounts for all the phenomena which have 
been observed, the secretion of milk being always found com- 
mensurate with the length of the inferior escutcheons, while 
it endures longer in proportion as the superior are more de- 
veloped. Taking this for our guide, it is easy, by the inspec- 
tion of the perineum, to estimate, with all the precision which 
marks vital phenomena in general, the activity and duration of 
the production of milk in milch-cows. 
M. H. BOULEY questions whether the direction of the hair 
externally betokens the direction of the subcutaneous arterial 
vessels. The hair upon a horse’s neck, or breast, or flank does 
not seem to him to mark any change in the course of the arte- 
ries. But even granting for a moment that there was truth in 
it, does it afford us any interpretation of that singular coinci- 
dence said to exist by Guenon between the quantity of milk 
furnished by the udder and the direction of the hairs growing 
upon it. The essential required for secretion is blood; and 
whether this blood is derived from above or below, or be 
brought by arteries running close together or far apart, running 
in straight lines or in flexuous ones — what signifies all this, pro- 
viding only the secreting artery be of the required volume to 
bring blood in sufficient abundance ? And, in regard to the 
powder produced upon the perineum being the result of blood 
transmitted to the part pregnant with the elements of milk, and 
so differing from blood elsewhere, M. Bouley likewise is a dis- 
sentient, inasmuch as he believes the blood to be in all parts 
homogeneous, the same in the brain as in the kidneys, in the 
