8 REVIEWS. 



of the naturalist. It was by far the best book on the general structure of 

 animals then available to the English reader ; and its lucid and graphic 

 descriptions, and the beauty of its intercalated wood-cuts — a mode of 

 illustration far from common at that time — conferred on it no ordinary 

 popularity, and rendered it an universal favourite with both professor and 

 student. 



Years, however, passed on, and zoologists continued to ply their work 

 with energy and zeal. Hosts of active investigators were busy, both at 

 home and abroad, with the scalpel and the microscope ; the dredge was 

 drawing from the deep new Invertebrate forms, to supply the missing link s 

 in the great chain-net of organization, and fresh light was being shed on 

 the nature, relations, and significance of Vertebrate structure. It can no 

 longer, therefore, be matter of surprise that the first edition of the work be- 

 fore us should have been passed in the great race of discovery, and that 

 other books fresh with the results of the physiological investigations of 

 the day should have been taking its place on the shelves of our libraries, 

 and in the hands of our students. 



A new edition was, therefore, loudly called for, and has accordingly 

 appeared; and it only remains now to be seen whether it has overtaken the 

 progress of science, and whether the " General Outline of the Animal King- 

 dom" is once more, after its long interval of rest, a true exponent of the 

 actual state of Anatomical Zoology. 



"We believe we may safely affirm that the present volume is a valuable 

 addition to the library of the zoologist, and one with which every student 

 of Comparative anatomy will do well to make himself acquainted ; and yet 

 we do not think that in all respects it has come up to the actual state of 

 science. 



We can refer to many of its chapters as excellent, and as containing 

 succinct and admirably given statements of recent investigations made in 

 various departments of physiological research — statements conveyed, too, 

 in that peculiar style of graphic description, in which we think the author 

 stands almost without a rival. 



Among the subjects in which the present volume has greatly the advan- 

 tage over its predecessor, we may instance the introduction of much new 

 matter into the chapter on the Protozoa ; of many of the results of Steen- 

 strup's and Van Beneden's researches into that on the Entozoa ; the 

 enlargement of the chapter on the Echinodermata, by the addition of some 

 of Mueller's important discoveries in the development of these animals ; of 

 that on the Annelida, by the discoveries of Milne-Edwards and of Dr. 



