SCIENCE.— AD VERTISEMENT8. 



"I began to study animals about 1857, and am still at it. My conclusions in the 

 matter agree substantially ivith your own. ... I am glad to find you keeping all 

 metaphysical, tbeological, and teleological speculation out of your science. 



" It seems to me that you express a great fact when you speak of neuroplasmic as 

 ■well as nerve action proper ; for otherwise we cannot account for the amount of sense an 

 amoeba certainly possesses." — De. Elliott Coues, Editor of The Osprey. 



Just Ready 



The 

 Dawn 



OF 



Reason 



Cloth, Crown 8vo, $1.25 



Mental Traits 



In the 

 Lower Aninnals 



By 



JAMES WEIR 



Jr., WI.D. 



Author of 



"The Physical Correlation of 



Religious Emotion and 



Sexual Desire." 



Cloth, cr. 8vo, $1.25 



New and Original 



of 



" A fascinating book . . . his observations are 

 tense interest." — The Congregationalist, Boston. 



" An exhaustive and scholarly study ... in a clear, 

 simple and brief form." — Louisville Times. 



" Exceedingly interesting . . . wholly original." — Louis- 

 mile Dispatch. 



" Any one interested in the progress of comparative psy' 

 chology must wish well to a man who, without the incentives 

 of the professed naturalist, makes it a labor of love to watch 

 animal life. 1, for one, shall welcome such observations, even 

 though they are more one-sided than Dr. Weir's. His favor- 

 itism toward animals, though it has deprived us of any records 

 of unintelligent conduct and perhaps prevented the repetition 

 of some tests and even distorted facts, has still failed to infuse 

 a very considerable number of suggestive and important obser- 

 vations. It will pay any student of animal psychology to read 

 the book for the sake of these. ... A sample of Dr. Weir's 

 keenness is his theory that the continual barking of dogs at 

 night is explainable by the supposition that they bark at an 

 echo. This hypothesis he supports by some very striking 

 facts." — Dr. Edward Thorndike, in Science. 



" The author is a bold and independent thinker as shown 

 by a previous work . . . and his observations profoundly 

 interesting." — The Chronicle, San Francisco. 



" Entirely new and a valuable addition to the evidence 

 already published by Darwin, Romanes, Lubbock, Buchner, 

 Kirby, Spence, and others." — The Evening Post, Chicago. 



" The work is one of thought and indicates laborious 

 study." — The Times, Louisville, Ky. 



"In this little book are gathered together a great many 

 interesting data . . . the author has observed and experi- 

 mented for himself and in many respects his conclusions are 

 striking and novel." — Literature. 



" One rises from the perusal of this fascinating book with a feeling as having heard 

 of a new world. . . . Space will not permit further allusion to this charming book, 

 but we advise all who are interested in such matters to obtain it." — Public Health. 



THE riACniLLAN COHPANY, Publishers, New York. 



