i44 THE POPULAR SCIENCE MONTHLY 



rock at Salem, Mass. ; Atlantic shore changes ; a raised beach at Marble- 

 head Neck; the porphyries of Marblehead; geological survey of Essex 

 County, Mass.; moulting of the lobster; malformation in lobster's 

 claws ; and biographical notices of George H. Emerson, Lucretia Crocker, 

 Spencer E. Baird, Jules Marcou and T. T. Bouve. Unfortunately, 

 his style is confused, for he uses too many adjectives and subjunctive 

 clauses, and rarely presents summaries of his conclusions. The com- 

 plexity of his elaborate terminology also tends to deter the general 

 reader, and he never sought to present his theories in simple language. 



His productive period began immediately after the publication of 

 Darwin's " Origin of Species " and ended just before the rediscovery of 

 Mendel's law of heredity; thus he was one of the leaders in that active 

 discussion of evolution during that speculative period which has now 

 been superseded by direct experimental tests of the theory itself. 



His last published papers are upon fossil cephalopods. In 1900, 

 he completed the revision of the nautiloids and ammonoids for East- 

 man's translation of Zittel's " Handbuch der Palaontologie " ; and after 

 his death a manuscript upon " Pseudoceraties of the Cretaceous " was 

 found lying upon his desk practically completed, he having written 

 upon it on the last day of his life. This work was edited by Dr. T. W. 

 Stanton and published as Monograph ISTo. 44 of the TJ. S. Geological 

 Survey in 1903. The last paper bearing his name was in cooperation 

 with Professor James Perrin Smith upon the " Triassic Cephalopod 

 Genera of America " and was published by the TJ. S. Geological Survey 

 in 1905, consisting of 394 pages and 85 plates composed of photographic 

 reproductions from the specimens themselves. Eor many years Hyatt 

 was paleontologist upon the U. S. Geological Survey and these later 

 papers were the results of his labors in this field. 



He was elected to membership in the American Academy of Arts 

 and Sciences at Boston in 1869 and was one of its vice-presidents at 

 the time of his death. In 1875 he became a member of the National 

 Academy of Sciences, and in 1895 of the American Philosophical So- 

 ciety of Philadelphia. He was also a foreign member of the Geological 

 Society of London, and was associated with other leading scientific so- 

 cieties both at home and abroad. In 1898 he received the degree of 

 LL.D. from Brown University, and he was one of the founders and 

 the first president of the American Society of Naturalists. 



His broad interest in all departments of knowledge, and his generous 

 heart and kindliness to all about him caused him to be surrounded by 

 a host of warm friends whose regard for him increased as years passed 

 by. Thus it was that he was a prominent member of those remarkable 

 social clubs of Boston which strove for the uplifting of humanity, and 

 for the refining and perfecting of ideals of culture. Such were the 

 Chestnut Street Club, a literary association numbering Longfellow, 



