SULFHURET OF IRON AN ANTIDOTE TO POISONS. 587 
known the incisor temporary teeth to be removed by breeders 
and dealers, and the permanent ones, in consequence, would 
make their appearance three or four months sooner. In the 
Veterinarian of 1845, p. 508, is Goodwin’s statement (who was 
Veterinarian to the Queen) of Running Rein and Bloodstone, 
c that they were foaled about the same period, weaned to- 
gether, taken up together, and every way treated alike, the 
younger of the two with the older mouth — a positive twehe 
months 5 older mouth. Is not this perfectly satisfactory that 
the test of the horse’s age by his teeth is at times fallacious ? 
It certainly goes to prove that it is possible for a colt to 
exhibit a mouth of tw T elve months older than he really is. 5 
To test the age by the teeth, the mouth alone should be well 
studied. The subject has been so ably handled by Mayhew, 
and other eminent writers, that nothing is left to write 
about ; but I would refer those who wish to be well posted 
on the subject to provide themselves with Mayhew’s works. 
The different periods of dentition in the horse having been 
so frequently explained and written about by others, it 
appears to me to be a work of supererogation to say anything 
about it here.” 
CAUSTIC COLLODION. 
Dr. Macke, of Sorau, has for some years successfully used 
a solution of four parts of bichloride of mercury to thirty 
parts of collodion, as a caustic. Its application is easy, being- 
performed with a camel’s hair brush. Its sphere of action 
may be perfectly determined, and it dries so quickly that it 
cannot extend to any neighbouring healthy part. 
If much inflammation supervene, cold lotions may be re- 
sorted to. The eschar is solid, and one or two lines in 
thickness, according to whether the caustic has been applied 
once or more frequently. The pain is seldom intense, and 
soon passes away, and the cicatrix left is but trifling. 
SULPHURET OE IRON AN ANTIDOTE TO POISONS. 
Mialhe has lately advanced the statement that the 
Hydrated Sulpiiuret of Iron is an antidote to all 
metallic poisons, except the cyanide of mercury, as it pre- 
cipitates arsenious acid, the salts of zinc, tin, lead, bismuth, 
