REPORT OF THE PRESIDENT, I908. 



35 



No. 92. Guide to the Archives of the Government of the United States at Washington. 



Revised and enlarged edition of Publication No. 14. By C. H. Van Tyne 



and W. p. Leiand. Octavo, xiii + 327 pages. 

 No. 93. The Rotation period of the Sun, as determined by the Motion of the Calcium 



Flocculi. By G. E. Hale and Philip Fox. 54 pages, 2 plates, 5 figures. 

 No. 94. The Structure and Life-history of the Hay-scented Fern. By Henry S. Conard. 



Octavo, 56 pages, 25 plates. 

 No. 95. Inheritance in Canaries. (Paper No. 10, Station for Experimental Evolution.) 



By C. B. Davenport. Octavo, 26 pages, 3 plates colored to life. 

 No. 96. Condensation of Water Vapor, as induced by Nuclei and by Ions. Report III. 



By Carl Barus. Octavo, vi -f 139 pages, 48 text figures. 

 C The Topography of the Chlorophyll Apparatus in Desert Plants. By W. A. 

 ^ ^ J Cannon. Octavo, 42 pages, 15 text figures, 5 plates. 



■ ^"1 Induction, Development, and Heritability of Fasciations. By Alice A. Knox. 

 [_ Octavo, 20 pages, i text figure, 5 plates. 

 No. 99. Botanical Features of North American Deserts. By D. T. MacDougal. Octavo, 



w + 112 pages, 62 plates, 6 text figures. 

 No. loi. The Variation and Correlation of the Taxonomic Characters of Gryllus. By 



Frank E. Lutz. Octavo, 63 pages, 6 text figures. 

 No. 106. Gases in Rocks. By R. T. Chamberlin. Octavo, 80 pages. 



The Institution has thus far issued in all 120 volumes, 

 which, excluding the Year Books, may be classified under 

 19 different fields of investigation. It will be instructive, 

 therefore, to note the relative numbers and aggregate costs 



of publications in the dift'erent fields. The data for comparison are supplied 



in the following table : 



Numbers and Costs 

 of Publications in 

 Different Fields of 

 Research. 



* Includes 6 volumes of Index Medicus (1903-07) at a cost of 854,835.89. Against this amount there 

 should be offset the amount of the subscriptions to and sales of this publication, namelj', 117,243.60. 



The necessary limitations set a year ago on the free distribution of publica- 

 tions have led to a marked increase in their sale and to a better understand- 

 ing of the Institution's inability to compete with govern- 

 mental bureaus in a lavish gratuitous dissemination of 

 books. xA-nd altho the broad question of the duties of 

 the Institution to the public in this matter is one which still gives rise to 

 much explanatory and controversial correspondence, it is plain that the 

 policy now adopted will soon meet with general approval. It is apparent 

 also that when the fact becomes generally known that editions of the works 



Sales of Publica- 

 tions. 



