REPORT OF THE PRESIDENT, I906. 3I 



of adequate returns would rise to practical certaintJ^ In almost every case, 

 in fact, in which aid has been given to investigators of such proved capacity 

 and opportunity good returns have been realized. Thus are we confronted 

 by the stubborn realities that there is no royal road to learning, and that of 

 the many who feel drawn toward the high calling of investigation few may 

 be chosen with the expectation that they will prove fertile in resources and 

 fruitful in results. 



This field of work is one of the most promising of those entered by the 



Institution. It is a field from which good results may be gleaned readily 



and made available speedily to the world at large. Thus 



Publications and their £^j. ;.„ volumes have been issued by the Institution and 31 

 Distnbution. ^' ■' "^ 



volumes are now in press. 



The following is a list of the 19 volumes issued during the past fiscal year : 



Year Book No. 4, 1905. Octavo, viil + 303 pages, 7 plates. 



Index Medicus, vol. 3. Octavo, 1449 pages. 



No. 9. The Collected Mathematical Works of G. W. Hill. Quarto, 4 vols. Vol. 2, 

 VII + 339 pages ; vol. 3, 577 pages. 



No. 22. Report on the Diplomatic Archives of the Department of State, 1789-1840. By 

 A. C. McLaughlin. Octavo, 73 pages. Revised edition. 



No. 34. American Fossil Cycads. By G. R. Wieland. Quarto, vii + 296 pages, 51 plates, 

 141 figures. 



No. 36. Studies in Spermatogenesis, part II. By N. M. Stevens. Octavo, 44 pages, 8 

 plates. 



No. 38. Writings on American History, 1903. Prepared under direction of A. C. 

 McLaughlin. Octavo, 172 pages. 



No. 40. The Nucleation of the Uncontaminated Atmosphere. By Carl Barus. Octavo, 

 XII + 152 pages, 104 figures. 



No. 41. Traditions of the Caddo. By G. A. Dorsey. Octavo, 136 pages. 



No. 42. A Respiration Calorimeter with Appliances for the Direct Determination of 

 Oxygen. By W. O. Atwater and F. G. Benedict. Octavo, 193 pages, 49 

 figures. 



No. 45. Catalogue of Stars within two degrees of the North Pole, deduced from Photo- 

 graphic Measures. By Caroline E. Furness. Octavo, 85 pages. 



No. 46. An Investigation into the Elastic Constants of Rocks, more especially with refer- 

 ence to Cubic Compressibility. By F. D. Adams and E. G. Coker. Octavo, 

 69 pages, 26 figures, 16 plates. 



No. 49. Heredity of Hair-length in Guinea-pigs, and its Bearing on the Theory of Pure 

 Gametes. By W. E. Castle and Alexander Forbes. (Paper No. 5, Station for 

 Experimental Evolution.) The Origin of a Polydactylous Race of Guinea- 

 pigs. (Paper No. 6, Station for Experimental Evolution.) By W. E. Castle. 

 Octavo, 29 pages. 



No. 50. The Relation of Desert Plants to Soil Moisture and to Evaporation. By Burton 

 E. Livingston. Octavo, 78 pages, 16 text cuts. 



No. 51. Studies on the Germ Cells of Aphids. By N. M. Stevens. Octavo, 28 pages, 4 

 plates. 



No. 52. Inheritance in Poultry. (Paper No. 7, Station for Experimental Evolution.) 

 By C. B. Davenport. Octavo, 136 pages, 17 plates. 



No. 53. Egyptological Researches. By W. Max Miiller. Quarto, 62 pages, 106 plates. 



No. 57. The Roman Comagmatic Region. By H. S. Washington. Octavo, 199 pages. 



These publications aggregate 3,166 octavo pages and 1,288 quarto pages, 

 making a total of 4,454 pages. 



