Those weren't his words, and his actual words (which he quoted above, acknowledging their ambiguity) could be (mis)read as meaning that injecting the urine killed the rabbit a few days later, especially since he also wrote "apparently [frogs] could survive the urine injection".
Those weren't his words, and his actual words (which he quoted above, acknowledging their ambiguity) could be (mis)read as meaning that injecting the urine killed the rabbit a few days later, especially since he also wrote "apparently [frogs] could survive the urine injection".
I do still find it odd that injecting urine into the frog repeatedly is OK for the frog, but perhaps the volume was quite small.