Januaky 24, 1908] 



SCIENCE 



139 



puted matters, and he avoided controversy 

 in a manner exemplary to younger men. 

 His public lectures were not popular by 

 reason of any eloquence of delivery or of 

 rhetorical skill, but because of their clear- 

 ness, simplicity and convincing quality of 

 accuracy. As a teacher he was particu- 

 larly successful ; having himself a splendid 

 grasp of the fundamentals of mathematics 

 and physics, he presented his subject logic- 

 ally, with emphasis on the essentials; and 

 his humor enlivened the class room. It is 

 doubtful if any teacher in this country 

 has enlarged the intellectual horizon of a 

 greater number of undergraduates than 

 has he, in his culture courses in astronomy. 

 "Twinkle" will never be forgotten by any 

 of his students. 



Professor Young's eminent services in 

 research and education received recog-ni- 

 tion in numerous academic degrees, mem- 

 bership in and awards from various learned 

 societies. 



He had suffered from Bright 's disease 

 for a niimber of years; but by good care 

 had kept himself fairly comfortable. The 

 loss of his wife seven years ago, after forty- 

 four years of a particularly happy married 

 life, came as a crushing blow to him ; and to 

 his sorrow was lately added the death, after 

 a year of distressing illness, of his widowed 

 daughter, who made her home with him. 



The retirement from his position at 

 Princeton in the summer of 1905 was made 

 the occasion of a grateful recognition by 

 his colleagues, and the appreciation shown 

 by his friends at that time must have been 

 a source of much gratification to him. He 

 then returned to Hanover, where he lived 

 quietly, until he succumbed to a brief at- 

 tack of pneumonia on January 3. Two 

 days later he was gathered to his fathers 

 in the old cemetery close to the house where 

 he was born. Edwin B. Frost 



Yerkes Obsekvatoky, 

 January 14, 1908 



SCIENTIFIC BOOKS 

 Experimental Zoology. By Thomas Hunt 

 Morgan, Professor of Experimental Zool- 

 ogy in Columbia University. New York, 

 The Macmillan Company. 190Y. 

 In a recent number of Science there ap- 

 peared an extensive review of this book, 

 which, in the opinion of the writer, does scant 

 justice to an important and valuable work. 

 It is with the thought, therefore, of calling 

 attention to some of the many valuable fea- 

 tures of the book that the following supple- 

 mentary review is written. 



Although experimental zoology is one of the 

 youngest of the sciences it has grown so rap- 

 idly that it is practically impossible for one 

 not working in this iield to keep pace with its 

 development. Until recently there was but 

 one journal devoted to this subject and much 

 of the literature pertaining to it is scattered 

 through publications which are more or less 

 inaccessible. From time to time there is 

 needed in every science, and especially in one 

 not well organized, some general work, which 

 will not only smnmarize results and bring 

 many scattered observations under one point 

 of view, but which will also awaken interest 

 in the subject and point out the direction of 

 needed research. 



Such a book is' this of Morgan's — a book 

 which is not only full of information, but 

 which is also illuminating and stimulating. 

 The writer of this notice has made this book 

 the basis of a course of reading for graduate 

 students in zoology with the most satisfactory 

 resiilts. The book discusses in a very concise 

 and direct manner a great range of experi- 

 mental work in zoology, much of which, it is 

 safe to assume, is relatively unfamiliar to 

 many zoologists. Although these discussions 

 are usually brief, they go straight to the heart 

 of the matter under consideration, and they 

 generally exhibit a critical insight and a 

 breadth of judgment which indicate a thor- 

 ough acquaintance with the phenomena in 

 question. By the variety and extent of his 

 own experimental work Morgan is probably 

 better fitted than any other man in America 

 to write a general work on experimental 

 zoology. 



