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SCIENCE. 



[N. S. Vol. XV. No. 373. 



various points from Labrador to Noank, 

 Conn., and explored many geological hori- 

 zons in Canada, the Maritime provinces, 

 New England, New York and the far west. 

 His published writings, though less numer- 

 ous than those of some of his contempo- 

 raries, are many and important ; they cover 

 a wide field in the Invertebrata, both fossil 

 and recent, and in some cases represent pi- 

 oneer work in the group studied. 



The titles of a few of the more important 

 of his publications may be noted: Obser- 

 vations on Polyzoa (1866-68) ; On the par- 

 allelism between the different stages of life 

 in the individual and those of the entire 

 group of the molluscous order Tetrabran- 

 chiata (1867) ; Fossil eephalopods of the 

 Aluseum of Comparative Zoology. Embry- 

 ology (1867) ; Revision of the North Ameri- 

 can Porifera (1875-77) ; The genesis of the 

 Tertiary species of Planorhis at Steinheim 

 (1880); Genera of fossil eephalopods 

 (1883-84) ; Larval theory of the origin of 

 cellular tissue (1884-85) ; Genesis of the 

 Arietidffi (1889) ; Bioplastology and the 

 related branches of biologic research 

 (1893) ; Phylogeny of an acquired charac- 

 teristic (1894); Cephalopoda (1900). 



From the beginning Professor Hyatt's 

 researches were very largely devoted to evo- 

 lutionary questions, and to the special study 

 of fossil eephalopods; at the time of his 

 death he was one of the foremost authori- 

 ties upon the fossil Cephalopoda. The true 

 value of his work upon this group must be 

 left for the future ; memoirs such as the 

 Genera of fossil eephalopods (1883-84), 

 and the chapter on the Cephalopoda 

 (1900) contributed to the English issue of 

 Zittel 's ' Paleontology ' cannot be properly 

 estimated by the present generation; they 

 require prolonged and detailed study 

 founded upon large series of specimens. 

 His theory of parallelism based on accelera- 

 tion and retardation, and his discoveries 

 concerning the laws of development, 



growth and decline were advocated with 

 persistence and vigor ; and while his treat- 

 ment is not always lucid, he is to be credited 

 as the originator of a distinct school, a 

 school devoted to exact methods of research. 

 The growth of this so-called Hyatt school, 

 never of greater importance than at the 

 time of his death, was a source of sincere 

 gratification to him. 



Samuel Henshaw. 



SCIENTIFIC BOOKS. 

 Dictionary of Philosophy and Psychology. 

 Written by many hands and edited by 

 James Mark Baldwin, Ph.D., with the co- 

 operation and assistance of an international 

 board of consulting editors. In three vol- 

 umes, with illustrations and extensive bibli- 

 ographies. Vol. I. New York, The Mac- 

 millan Company. 1901. 

 In considering an enterprise of such mag- 

 nitude as this dictionary offered by Professor 

 Baldwin, the reviewer should keep in mind 

 several important points. He should remem- 

 ber the purpose which guided the editor in 

 his work, its value to those for whom it is 

 especially intended, and the great difficulties 

 of the undertaking. He should not measure 

 it by ideals which the editor never aimed to 

 realize and which it was not necessary for him 

 to realize under the circumstances. Two pur- 

 poses are combined in the work. Professor 

 Baldwin tells us — 'first, that of doing some- 

 thing for the thinking of the time in the way 

 of definition, statement and terminology; and 

 second, that of serving the cause of education 

 in the subjects treated.' The task, therefore, 

 is 'to understand the meanings which our 

 terms have, and to render them by clear defini- 

 tions ; and to interpret the movements of 

 thought through which the meanings thus de- 

 termined have arisen, with a view to discover- 

 ing what is really vital in the development of 

 thought and term in one.' The other part of 

 the problem is pedagogical and carries with it 

 the duty 'to state formulated and well-defined 

 results rather than to present discussions.' 

 The reader, therefore, who expects to find noth- 

 ing but original articles written for experts 



