REVIEW. 507 
muscles as in the bones; the difference of the products depend- 
ing upon differences of affinity in the secretory agents. 
M. Renault quite agreed in opinion with M. Bouley. 
M. Magne’s theory to him by no means appeared explanatory 
of the system of Guenon. But, the first thing to be done is to 
ascertain if this ** system” have any foundation ; and, after that, 
we may enter on the explanation of it. 
M. Magne said it was his desire, in the paper he had read 
to the Society, to treat the question but as one purely scientific ; 
he had no other view than to submit his explanation of the obser- 
vation of a fact which, up to the present time, had remained 
uninterpreted. As for the objection made by M. Bouley rela- 
tive to the nature of the blood conveyed by the different secret- 
ing vessels, the opinion I gave of its peculiar impregnation was 
not one of my own, but what has been adopted by some physio- 
logists, with whom it had originated out of analyses made of the 
blood contained in various divisions of the circulating system. 
M. DELAFOND observed, that if the theory was worth any- 
thing, it ought to be applicable to all cases. Now, there are 
cows who have the escutcheon so large that it reaches up to the 
vulva; so implying, according to Guenon’s system, high lacti- 
ferous properties. But, by the side of this large escutcheon, there 
is another little ovoid body on either side of the ascending hair. 
This sign, according to Guenon, invariably denotes the cow to 
be cross-bred, prognosticating that she will give milk at her first 
calving, but none at her second ; or if any this time, less 
than formerly. I ask M. Magne, if the direction of the rows of 
hair implies the direction of the artery, how does the pre- 
sence of the little escutcheon, situated to the outer side of the 
former, influence the course of the blood in cross-bred cows ; 
and whether it operates against the secretion of milk at the 
end of the third or fourth calvings'? Another objection is, 
that since M. Magne informs us that the escutcheon indicates 
the development of the arterial system of the udder, how he 
reconciles this theory with the fact, that we meet with the 
escutcheon in bulls known to beget good milch cows] Here 
the escutcheon can have nothing to do with the lacteal secre- 
tion. It is also of consequence, in the resolution of this ques- 
tion, to know which of the two apparatus is the first-formed, 
the glandular or the vascular — whether the call for increased 
function in the gland has v caused the supplying vessels to 
become augmented, or whether the augmentation of the latter 
has occasioned more secretion in the gland. 
M. RENAULT observed, that there were cows who had largely 
developed udders, and ought to have proportionably developed 
