From a study of Dr. Harley's experiments,[472] however, made a few years
ago, there would appear to have been but little difference between the
activity of Petit's and Morson's aconitine. Dr. Harley experimented on a
young cat, 3 lbs. in weight, and nearly killed it with a 1/1000 of a
grain of Morson's aconitine; two other cats, also weighing 3 lbs. each,
died in seven and a half hours and three-quarters of an hour
respectively, killed from a subcutaneous dose of of a grain. Reducing
these values to the ordinary equivalents, the dose, after which the cat
recovered with difficulty, is equal to about .048 mgrm. per kilo.,
while a certainly fatal dose is .092 mgrm. per kilo.; therefore, it
seems likely that the least fatal dose for Morson's, as for Petit's, is
some number between .075 and .09 mgrm. per kilo.