In the first

place then, the brain lies in the front part of the
head. And this holds alike with all animals possessed of a brain;
and all blooded animals are possessed thereof, and, by the way,
molluscs as well. But, taking size for size of animal, the largest
brain, and the moistest, is that of man. Two membranes enclose it: the
stronger one near the bone of the skull; the inner one, round the
brain itself, is finer. The brain in all cases is bilateral. Behind
this, right at the back, comes what is termed the 'cerebellum',
differing in form from the brain as we may both feel and see.