In Fact Van Helmont said this-
"When water from the purest spring is placed in a flask steeped in leavening fumes, it
putrefies, engendering maggots. The fumes which rise from the bottom of a swamp
produce frogs, ants, leeches, and vegetation. . .Carve an indentation in a brick, fill it with
crushed basil, and cover the brick with another, so that the indentation is completely sealed.
Expose the two bricks to sunlight, and you will find that within a few days, fumes from the
basil, acting as a leavening agent, will have transformed the vegetable matter into veritable
scorpions."
See, perectly obvious!
Snails just appear.
doris