THIS small book contains a useful elementary account of the structure of the sheep's brain intended, as its sub-title suggests, for first-year students of zoology. The brain of the sheep from its size and the ease with which it can be obtained and handled affords a much better object for study than the brains of the smaller mammals generally employed for dissection in this course. The detail given is well suited for first-year zoology, but the medical student would also find it helpful to work through it as a revision exercise before passing on to the detailed study of the more complex human brain. The text is written in a clear and straightforward manner, and the well-produced illustrations add considerably to its usefulness.