Nov. 6,i 88o.] THE BRITISH, AEDIC4AL _OZRNAL. 745 important feature in the book. is, that the more. general parts are printed in large type, while, for much of the theoretical matter, the details of various special mod-es of development, the histories of the less important forms, and for controversial matter generally, a smaller type is used. This is of great use to the students who are only beginning embryological studies, as it enables them at once to see what portions are of primary

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... ce for them to learn, a thing that is especially difficult in a new and as yet only partially explored branch of science such as embryology, owing to the number of incomplete and contradictory observations, still to be settled, which it contains.