INFLUENCE OF THE VAPOURS OF LEAD. 255 
recover them. If they pass the age I have mentioned without an 
attack of this disease, they grow strong and healthy ; and I have 
killed them when two years old, weighing twenty-six pounds 
per quarter. From the interest which I know you take in these 
matters, I have sent you, by the bearer, one of the lambs about 
five weeks old, and a fleeted in the manner I have described, which 
you may experiment upon, and perhaps discover the cause of the 
disease, and the means by which it may be cured. The lamb 
I have sent you was a twin, wdiich its mother would not take 
to, and has been brought up in a cotter’s house : it is, on that ac- 
count, not so large as the other lambs of the same age. You will 
observe, that both in shape and wool it partakes of the peculiari- 
ties of the father’s breed. He has no tail, but a large mass of fat 
instead. The Cheviots, you are aware, have a long tail : their 
representative in this part shews the union of the two. The lamb 
which you will receive is black ; but they are not all so, the majo- 
rity being white, and some spotted black and white. The ram is of 
a brownish colour. I shall be happy to be favoured with an account 
of any experiments which you may think of making upon the sub- 
ject sent. 
[A variety of remedies were tried, but without effect. After 
death an effusion of serum was found in the lateral ventricles of 
the brain. — D.] 
ON THE INFLUENCE OF THE VAPOURS OF LEAD 
ON DOMESTIC ANIMALS. 
By A. Tuosseau, D.M.P. 
By publishing these short remarks, I wish to draw the atten- 
tion of veterinarians to a fact which seems to me of some im- 
portance, and to engage them to make known any observations 
of the same nature which may have occurred in their practice. 
There is at Tours a manufactory of minium (red oxyde of 
lead) at which a considerable number of workmen and several 
horses are employed. A great many persons are every year re- 
ceived into and treated in the hospital, who are the victims of 
this kind of work, and their symptoms are all those of colic from 
lead. The horses belonging to the establishment are soon af- 
fected with roaring ; the respiration becomes more and more 
difficult, and is very loud when the animal takes any violent exer- 
cise ; and if the owners wish to preserve the horse, they are often 
compelled to perform the operation of tracheotomy, and to keep 
the opening from closing by means of a large tube, until all the 
symptoms disappear, and the respiration becomes easy. M. 
