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Defective Eyesight : The Principles of Its Relief by Olasses. 



By D. B. St. John Roosa, M.D., LL.D., Professor Emeritus of Diseases of the Eye and Ear, Post Graduate Med- 

 ical School and Hospital ; Surgeon to the Manhattan Eye and Ear Hospital, etc., etc., author of "A Clinical 

 Manual of Diseases of the Eye ; " " Ophthalmic and Otic Memoranda ; " "A Practical Treatise on the Dis- 

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aoth. 12mo. §1.00, net. 



No pains have been spared to make the manual a complete guide to the practitioner who wishes to under- 

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A Text Book of the Embryology 



Of Inverteljrates. By Dr. E. Kokschelt, Pro- 

 fessor of Zoology and Comparative Anatomy in the 

 University of Marburg, and Dr. K. Heider, Pro- 

 fessor of Zoology in the University of Berlin. 



Vol. I. Porifera, Cnldaria, Ctenophora, Vermes, En- 

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 ward L. Mark, Ph.D., Hersey Professor of An- 

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" The book has been in the hands of zoologists all 



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indispensable reference book." — Professor Jacob Reig- 



HARD in Science. 



Vol. II. Phoronidea, Bryozoa, Ectoprocta, Brachio- 

 poda, Entoprocta, Crustacea, Palseostraca. Trans- 

 lated by Matilda Bernard. Revised and Edited, 

 with Additional Notes, by Martin F. Woodward, 

 Demonstrator of Zoology, Royal College of Science. 

 8vo. Cloth. Pp. xv+375. 153.00, net. 

 The second part of a work described in the review 



quoted above as "so well done that the book is likely 



to remain for many years without a rival." 

 Part III. is in preparation. 



Of Man anil Iflammals. By Dr. Oscar Hert- 

 wiG, Professor Estraordlnarius of Anatomy and 

 Comparative Anatomy, Director of the II. Anatom- 

 ical Institute of the University of Berlin. Trans- 

 lated from the Third German Edition by Edward 

 L. Mark, Ph.D., Hersey Professor of Anatomy in 

 Harvard University. Second Edition, with 339 

 Figures in the Text and 2 Lithographic Plates. 



8vo. Cloth. Pp. xvi+670. |5.25, net. 

 " While it is in details largely confined to the study 

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"The translator's work has been exceptionally 

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 and Surg. JouTnal. 



THE 



DAWN 



OF 



REASON 



Mental Traits 



in tlie 

 Lower Animals 



" Any one interested in the progress of comparative psychology 

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"The author is a bold and independent thinker, as shown by a 

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" In this little book are gathered together a great many interesting 

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JAMES WEIR, Jr., 

 M.D. 



Author of 

 "The Physical Corre- 

 lation of Religious 

 Emotion arid Sexual 

 Desire. ' ' 



Clotii, cr. 8vo, 



$1.25. 



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