DURING THE SCHOLASTIC YEAR 1837-8. 
195 
This continuance of the vesicle until a very advanced period in 
the solipede — until parturition in the carnivora — and the great vas- 
cularity of its parietes, have made us think that the organ has 
other uses, as yet unknown, beside those which are generally at- 
tributed to it. 
On the portion of the second sac, which bordered on the cord, 
and near the infundibulum which forms the urachus in order to 
terminate by the allantois, we have observed a vascular plexus, 
of the form of a bird’s foot, between the branches of which the sac 
has more opaque parietes than in the rest of its extent. Dissection 
has proved that this opacity was produced by a peculiar membran- 
ous pouch, completely empty, and placed between the amnios and 
the amniotic membrane of the allantois, from which it is easily 
detached. The ombilical vesicle terminates near this membranous 
pouch, and at this point, also, the amnios forms a little conical cul- 
de-sac against the cord. We will endeavour to discover what is 
the intention of this pouch, which we had never before observed. 
M. Mollard, veterinary surgeon at La Tour du Pin, has sent to 
us the foetus of a goat, found by the butcher in the abdominal ca- 
vity. The uterus was whole, and without any traces of gestation. 
M. Mollard saw the foetus fixed near the umbilical region by some 
very short vessels and ligaments. It was surrounded and strongly 
compressed by an envelope, having much analogy to the epiploon, 
and adherent to the skin through its whole extent. 
Chemistry. 
The pump which supplies the hospital with water, undergoing 
some repairs, there was found on the inside of the copper pipes of 
which it was formed, layers, two lines in thickness, of a salt, which 
the colour announced to have copper as its basis. The horses in 
the hospital having often had fits of spontaneous colic, and even 
defluxions from the chest, which we had been accustomed to attri- 
bute to the coldness of the water of that pump, given in the morn- 
ing on an empty stomach, we determined to examine whether 
these depositions were the cause of these accidents. The result of 
our researches was, 
1. That these salts are formed of oxide and carbonate of copper. 
2. That they are completely insoluble in cold water. 
3. That no re-agent determines the existence of these salts in 
the water in which they have been immersed more than twenty 
days. 
4. That of the animals which, for more than a month, have drunk 
of the water in which this oxide and carbonate of copper have been 
placed, none have experienced the slightest derangement of health. 
