I catch your drift now.

Lethodyne is poison to phlegmatic patients, who have not active power enough to wake up from it unhurt; it is relatively harmless to the vivid and impassioned, who can be put asleep by it, indeed, for a few hours more or less, but are alive enough to live on through the coma and reassert their vitality after it." I recognised as he spoke that this explanation was correct.

The dull rabbits, the sleepy Persian cats, and the silly sheep had died outright of lethodyne; the cunning, inquisitive raccoon, the quick hawk, and the active, intense-natured weasels, all most eager, wary, and alert animals, full of keenness and passion, had recovered quickly.
"Dare we try it on a human subject ?" I asked, tentatively.
Hilda Wade answered at once, with that unerring rapidity of hers: "Yes, certainly; on a few--the right persons.

_I_, for one, am not afraid to try it." "You ?" I cried, feeling suddenly aware how much I thought of her.

"Oh, not YOU, please, Nurse Wade.