PROCEEDINGS OF THE OHIO ACADEMY OF SCIENCE. 301 



Text Books. The extensive geologic text of Eduard Suess, 

 begun in the 8o's, was completed a few years ago, not long before 

 his death. This remarkable set of books has inspired emulation 

 in several other countries. The comprehensive text of Geike in 

 two volumes was very completely revised and republished in 

 1903. In this country a similar feat of scholarship has been ac- 

 complished by Chamberlin and Salisbury. It is doubtful whether 

 we will have many more such texts. Geology as a science has 

 become so sub-divided, and so much detail worked out in each 

 field, that a general text book, to be complete, must be ency- 

 clopedic in size and would be little used except in libraries. 



The last decade has witnessed the appearance of special 

 books, each covering a particular field, as the dynamic, struc- 

 tural, tectonic, glacial, and paleontologic phases of the subject. 

 Furthermore, special parts of these fields are beginning to have 

 their individual manuals. This diversity of texts is to be ex- 

 pected as a result of the growing number of specialists in ge- 

 ology. 



Periodicals. Twenty-five years ago. The American Geologist 

 was the only American periodical in this field of science. In 

 the year 1890. the Bulletin of the Geological Society of America 

 began publication. Three years later the Journal of Geology 

 was founded. In 1905, The American Geologist was in- 

 corporated with Economic Geology which first appeared in that 

 year. The Bulletin of the Seismological Society of America 

 dates from 1910. This large gain in the list of serials indicates 

 an activity for which ample provision is not found in the pub- 

 lications of the federal and state surveys, or of learned societies. 



United States Geological Survey. A national survey is a 

 fair index of the status of geology in a country. Appropria- 

 tions and men make a survey ; an abundance of one can not at 

 once offset a shortage of the other, but may tend to create an 

 ample supply. 



From 1890 to 1901 the lowest appropriation allowed the fed- 

 eral Survey any year was $494,640; the highest was $1,000,- 

 159.25; the average for the 12 years was $757,277.90. Since 

 1 90 1, including 191 6. the average annual appropriation Was 

 $1,544,048.33. In 1907 the irrigation work was withdrawn from 



