Translator's Preface. 



either his psychological definitions or his psychogenetic 

 reservations," we call the critic's attention to the end 

 of the fourth chapter of "Instinct and Intelligence in 

 the Animal Kingdom," where Prof. Wheeler's objec- 

 tions have been answered. 



In order to make the English translation more 

 valuable for North America, the author has kindly 

 added a series of notes and observations on the ant 

 fauna of the United States. He has added, moreover, 

 the figures representing the North American form of 

 Formica sanguined and that of its guest Xenodusa 

 cava. The present work, therefore, is more than a 

 translation ; it may be called a new edition, revised 

 and enlarged by Father Wasmann. 



Canisius College, Buffalo, N. Y. 



