550 THE POPULAR SCIENCE MONTHLY. 



Omitting purely literary productions, these cover one hundred and 

 seventeen titles. 



In the "American Naturalist," commencing with Vol. IV, 1870, 

 to Vol. XIX, inclusive thereof, will be found contributions by him 

 under forty-nine titles, covering 228 pages. 



Twenty-two of these papers are leading articles ; the others are 

 " notes." They are all either archaeological or zoological. The for- 

 mer, twenty-five in number, include the first communications by him, 

 on the occurrence of palaeolithic man in the valley of the Delaware 

 River ; and the article, on " The Stone Age in New Jersey," which 

 was the basis from which his more elaborate works to be hereafter 

 mentioned were developed. 



Twenty-seven articles or notes in the " Naturalist " are zoological, 

 and twenty-five of them treat of birds or fishes of New Jersey ; of 

 the other two, one is on the " Habits of Cray-fish," and the other is on 

 " Winged Ants." 



The most important zoological paper of this series is that on 

 " Traces of a Voice in Fishes." In this article, Dr. Abbott aims to 

 show that a relationship between color and voice obtains among our 

 fresh-water fishes ; that brightly colored fishes are diurnal in habits 

 and attract the eye of the opposite sex, in the breeding-season ; but 

 dull-colored fishes are nocturnal, and the sexes are attracted by the 

 ear. Studies in the tropics of marine fishes tend to confirm this 

 view. 



He has contributed to the English journal, " Science Gossip," be- 

 ginning in 1872, first under the editorship of M. C. Cooke, and after- 

 ward of Dr. John E. Taylor, twenty articles, of which eighteen were 

 illustrated. 



In " Science," Vols. I to VI, both inclusive, are seventeen communi- 

 cations, eight of which are leading articles. Those on the " Intelligence 

 of Fishes," and supposed " ^Estivation of Mammals," have attracted 

 much attention. In the articles on " Hibernation," Abbott aims to 

 show that, in so fluctuating or uncertain a climate as in New Jersey, 

 hibernation is not so fixed a habit as has been supposed, and is 

 "optional" with many mammals ; they hibernating when cut off from 

 food-supplies, and so avoiding starvation. Intelligence appears to 

 play a prominent part in this series of articles, for, besides the " Intelli- 

 gence of Fishes," already mentioned, we find among them papers on 

 the "Intelligence of the Crow" ; of " Birds" ; of " Batrachians" ; and 

 of "Snakes" ; and one on " Color-Sense in Fishes." The archaeologi- 

 cal articles relate the occurrence of amber near Trenton, New Jersey^ 

 and of mound-builders' pipes in New Jersey ; and concern "Palaeolithic 

 Man in Ohio," "Evidences of Glacial Man," and "Eastern and West- 

 ern Indian Implements." 



To "Nature" he contributed, in 1872, "American Flint Arrow- 

 Hcads," " Origin of American Indians," and " Feeding Habits of the 



