THE OOLOQIST IX 



interfere with the popular presentation of the subject matter as a whole. 

 One of the chief features of the work consists in the elegant half-tone plates 

 reproduced from a remarkable series of photographs, all made by Dr. Shu- 

 feldt himself from the living forms. Fully four-fifths of these are of the size 

 of life, and present the subjects in their most characteristic attitudes, and 

 frequently with all the natural surroundings of their haunts in nature. From 

 this point of view alone, these figures constitute a series highly calculated to 

 help teachers and parents throughout the world; to educate students and pupils 

 of all ages in the correct appreciation of form of living creatures; and finally, 

 to stand as models of great value for the use of artists and taxidermists. In- 

 deed, the work cannot fail to be but of the greatest use to teachers in the 

 public schools throughout the United States, while in the library of the 

 general reader it will fill the place of one of a class of works upon natural 

 history, which, in this age of biological literature, are only too rarely pro- 

 duced, given over, as the majority of them are, to the more technical treat- 

 ment and aspects of science. The author. Dr. Robert W. Shufeldt, is well 

 known as an emient writer on popular and scientific natural history, for many 

 years Associate Zoologist at the Smithsonian Institution. 



Royal Octavo, Extra Cloth, Gold Top, 480 Pages. New York, 1900. 

 Published for $3.50 net. OUR SPECIAL PRICE $1.00 



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Natural History. 



TEXT-BOOK OF THE 



EMBRYOLOGY OF INVERTEBRATES 



By DR. E. KORSCHELT and DR. K. HEIDER. 



Translated from the German by Edward L. Mark, W. McM. Woodworth 

 and Matilda Bernard. Revised and edited with additional notes by Martha F. 

 Woodward. 



The broadest, most comprehensive and exhaustive work on the subject. 

 In method of treatment the authors proceed from the special to the general. 

 The translators, on account of the rapid advance of the science since the date 

 of first publication, have supplemented the text by numerous additions, both in 

 the body of the text and in foot-notes, giving a succinct statement of the re- 

 sults of recent embryological research. In this work they were fortunate in 

 having the co-operation of the authors themselves, and all interpolations in 

 the text are bracketed, thus rendering it unnecessary to compare with the 

 original to ascertain what is new. Each of these additions, together with the 

 foot-notes, is followed by the initial of the author, or by the word "Trans- 

 lators," to indicate the persons responsible for the new matter. 



This work is comprised in four volumes as follows: 

 Vol. I. — Porifera, Cnidaria, Ctenophora, Vermes, Enteropneusta, Echinoder- 



mata. 

 Vol. II. — Phoronidea, Bryozoa, Ectoprocta, Brachiopoda, Entoprocta, Crustacea, 



Palaeostrica. 

 Vol. III.^ — Arachnida, Pentastomidae, Pantopoda, Tardigrada, Onychophora, 



Myriopoda, Insecta. 

 Vol. IV. — Amphineura, Lamellibranchia, Solenoconcha, Gastropoda, Cephalo- 

 poda, Tunicata, Cephalochorda. 



The volumes are profusely illustrated. 8vo. cloth, uncut and unopened. 

 N. Y. (The Macmillan Co.), 1895-1900. Publishers' Price, $14.25 net. 

 OUR PRICE $3.75 



FREDERICK LOESER & CO. 



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