242 
ON HYDRATED PEROXIDE OF IRON, ETC. 
time of death appeared to be hastened exactly in proportion 
to the delay.* 
Again, Drs. Borelli and Demaria, of Turin, performed ex- 
periments also on dogs with even more favorable results. 
They consider that four and a half parts by weight of the pe- 
roxide are required to neutralize one of arsenious acid,t 
Dr. Van Specz, of Vienna, had similar success. He gave 
arsenic both in powder and in solution, and though in the 
last the symptoms were more violent, yet in all the animals 
recovered. He even exhibited the rust of iron successfully. t 
Dr. Donald Mackenzie, of Edinburgh, has related a number 
of successful experiments on dogs, with arsenic in the solid 
form, followed by the antidote in the proportion of from 
twelve to thirty parts. They were killed, either on the first, 
third, or sixth day after, and the stomach and intestines were 
found but slightly reddened-§ 
Lastly I may mention the result obtained by a committee 
of the Academy of Medicine at Paris, in which not only the 
hydrated peroxide was found efficient on dogs, but also the 
common subcarbonate of iron largely suspended in water, 
four ounces in twenty-four of water. The committee advise 
that at least half an ounce of peroxide should be taken for 
each grain of arsenious acid supposed to remain in the 
stomach. || 
To all this mass of favorable testimony, there can only be 
opposed the unfavorable results obtained by Mr. Brett and 
Mr. Orton, ( London Medical Gazette, vol. xv. p. 220, Lan- 
cet, November 8, 1834.) But it must be remembered that 
these investigations were made at an early period of the in- 
quiry ; and I may further adopt the remarks of Dr. Maclagan, 
♦British and Foreign Medical Review, vol. i. p. 594. 
f British and Foreign Medical Review, vol. i. p. 595. 
^ American Journ. Med. Sci., February, 1838, p. 519. 
§ Lancet, April 4, 1840. American Journal Medical Science, August, 
1840, p. 497. 
|| American Journal Med. Sci., February, 1838, p. 519. 
