The change is observed to take place very rapidly along the hair, and on a given animal affects only certain kinds of hair.
(The change; is observed; to take place very rapidly along the hair) (The change; to take very rapidly; L:along the hair) (on a given animal; affects; only certain kinds of hair)
The change The change on a given animal
is observed to take very rapidly affects
to take place very rapidly along the hair
L:along the hair
only certain kinds of hair