It is not quite certain whether a true pepsin exists in plants, but many trypsins have been discovered, and one form of erepsin, at least, is very widespread.
Their function is not quite clear.
The birds of Liberia are not quite so peculiar as the mammals.
The amount of iron and steel produced in the Urals is not quite 20% of the total in all European Russia and Poland.
He adds, what is not quite clear from one who so frankly acknowledges his limited acquaintance with the science, that he had reason to congratulate himself that he knew no more.
