perhaps it was known that hCG is present in the urine of pregnant women.
and also that hCG induces ovulation in frogs.
If injecting frogs with urine is cheaper than other methods of detecting signaling horomones.. well, there ya go.
and also that hCG induces ovulation in frogs.
If injecting frogs with urine is cheaper than other methods of detecting signaling horomones.. well, there ya go.
Unrelated, but as for the origin of the latin term "vacca", it may come from vedic, with the meaning of "the animal that moos"
Edit: made my answer more to the point
Just mentioning this for other people who like looking up words. And yes it's obvious... unless you're one of those people who sometimes overthinks search terms.
the author actually followed some alchemical recipes which were thought to be nonsense. yet under the right conditions (using iron implements, bad control of temperatures, impure materials) they produced results that must have seemed miraculous at the time — fluorescent materials, elaborate crystalline structures, and so on.