Show why kves are aud dark an interesting point is the canse of the different shades of color we see iu the eyes on a certain membrane in the interior are numerous cells called pigment cells when these are present in very great numbers they produce that deep black color of gome eyes and in proportion to their numbers decrease tilso the depth of color finally a light blue is reached in certain eyes these pigment cells do not esitt at all being wanting indeed all through the system hair and alrin A of this description is called an albino and among animals we find a parallel in the case of the white rabbit chambers journal |