IN reviewing this book in THE LANCET of Feb. 4th, 1911, on its first appearance, we were enabled to congratulate Professor McFarland on the admirable manner in which he had carried out his aim in providing first an excellent summary of the elements of biology for general readers, and, secondly, in the attention devoted to the more specialised medical aspects of the subject, so as to offer to general practitioners of medicine a broad but accurate survey of various fields of new knowledge. The

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... mer object naturally remains much in st(itii 1j1l0,o but as regards the latter the present volume introduces such new matters as will bring the contents up to date and increase the usefulness of the book for medical readers particularly. The second half of the book, beginning with the chapter on ontogenesis, which is followed -by chapters on conformity to type, divergence, -structural relationship, blood relationship, parasitism, infection and immunity, mutilation and regeneration, grafting, senescence, decay, and death, gives a just summary of contending theories in language that will tend to afford a good bird's-eye view of the present status of knowledge and opinion. We note a slight blemish on p. 226, repeated elsewhere, where " foeti " is used as the plural of foetus. Foetus is, of course, fourth declension, and the plural, therefore, is also foetus. But in English why not foetuses '? The book is an admirable one, clearly written so as to be intelligible to those without much preliminary biological training, and well printed and got up.