RESEARCH FOR ARSENIC AND ANTIMONY. 
677 
evidence of the form and substance of the insensible horn; 
while continuous labour exacted from the animal would 
show the necessity of some temporary protection, removeable, 
perhaps, at will, to prevent his becoming incapacitated by 
the too rapid wearing away of the horny covering of his feet. 
Of the antiquity of the latter-named defence there is ample 
proof in the paper in question ; and although w r e*'agree with 
the late Professor Coleman, that he who first nailed a piece 
of iron to the foot of the horse was indeed a bold man, 
still we believe that it was done in very early times, and soon 
after men had become familiar with the facts to which we 
have alluded. 
We hope to hear that Mr. H. Syer Cuming has con¬ 
tinued his researches and been able to fix with tolerable 
accuracy the date of the nailing on of shoes, and we trust 
that we shall be enabled to give these conclusions in an 
early number of our Journal. 
Extracts from British and Foreign Journals. 
FACTS AND FALLACIES CONNECTED WITH THE RESEARCH 
FOR ARSENIC AND ANTIMONY; WITH SUGGESTIONS FOR 
A METHOD OF SEPARATING THESE POISONS FROM 
ORGANIC MATTER. 
By Alfred S. Taylor, M.D., F.R.S. 
0 Continued from p. 548.) 
5. River water , containing arsenic .—This was probably as 
severe a test as could be selected for the process. Two sam¬ 
ples of water, one of two gallons and the other of one gallon, 
taken, at an interval of six months, from a pipe supplying an 
inn in a country town, were respectively evaporated to dry¬ 
ness. Each left a dirty, ochreous-looking deposit, weighing- 
in the larger sample twenty grains, and in the smaller sample 
thirteen grains. The acid distillates of these residues were 
successfully placed in the small tube-apparatus for generating 
hydrogen, described at p. 543 ; and a capillary tube was con • 
nected by a cork* with the chloride-of-calcium tube. Some 
lead paper was also introduced into the mouth of this tube, 
* I have found in these researches that when vulcanized rubber is made 
the medium of connexion for the glass tubes, some sulphur is invariably 
carried over. 
