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Facts and Observations. 
EFFECTS OF LEAD ON ANIMALS. 
M. Pecatjlt Taschereau, a manufacturer of red lead at 
Tours, has published some curious observations touching the 
effects produced by the salts of lead on certain domestic 
animals. These salts, which are known to have deleterious 
effects upon man, produced none whatever on dogs, while, on 
the contrary, cats that inhabit white lead factories are very 
short-lived, and do not long resist the effects of the dust with 
which the air is charged. The horses belonging to such 
factories are seized with a curious affection — viz. a paralysis 
or obstruction of the larynx. In such cases M. Delaunay, a 
veterinary surgeon, has successfully had recourse to the 
operation of tracheotomy, and has observed that, this 
operation once performed, the horse is not attacked a second 
time with the same affection. M. Roart, of Clichy, has found 
that rats exposed to the emanations of lead are affected with 
paralysis in their hind legs, and may thus be easily killed. — 
Medical Times. 
POISONOUS EFFECTS OF THE EUPHORBIA ARBORESCENS. 
Dr. Livingstone, in his f Travels in South Africa/ directs 
attention to the poisonous effects of the milky juice of the 
Euphorbia arborescens . “ This, “ he says,” is particularly ob- 
noxious to the equine race. When a quantity is mixed with 
the water of a pond, a whole herd of zebras will fall dead 
from the effects of the poison before they have moved away 
two miles. It does not, however, kill oxen or men. On 
them it acts as a drastic purgative only. This substance is 
used all over the country, though in some places the venom 
of serpents and a certain bulb, Amaryllis toxicaria , are added to 
increase the virulence.” 
NOVEL METHOD OF CAUTERIZING TUMOURS. 
M. Maisonneuve has imparted to the French Academy 
what he calls a new method of cauterizing, with the object 
of destroying tumours. He attacks them by his method, not 
only at the circumference, but in their interior, and without 
