EEPORT OF THE SECRETARY. 113 



Volume 62. 



No. 4. Reports on wind tunnel experiments in aerodynamics. By J. C. Hunsalier, 

 E. Bucli;ingliam, H. E. Rossell, D. W. Douglas, C. L. Brand, and E. B. 

 AVilson. Hodgkins Fund. January 15, 1916. 92 pp., 5 pis. (Publ. 

 2368. ) 



No. 5. Dynamical stability of aeroplanes. By Jerome C. Hunsaker, assisted by 

 T. H. Huff, D. W. Douglas, H. K. Chow, and V. E. Clark. Hodgkins 

 Fund. June 30, 1916. 78 pp., 3 pis. (Publ. 2414.) 



Volume 63. 



No. 6. Smithsonian Physical Tables. Reprint of sixth revised edition. By F. E. 

 Fowle. February 18, 1916. xxxvi+355 pp. (Publ. 2269.) 



Volume 6Jt. 



No. 8. Cambrian Geology and Paleontology. Ill, No. 3. Cambrian trilobites. By 

 Charles D. Walcott. January 14, 1916. Pp. 157-258, pis. 24-38. 

 (Publ. 2370.) 



No. 4. Cambrian Geology and Paleontology. Ill, No. 4. Relations between the 

 Cambrian and pre-Cambrian formations in the vicinity of Helena, 

 Montana. By Charles D. Walcott. June 24, 1916. Pp. 2.59-301, pis. 

 39-44. . (Publ. 2416.) 



No. 5. Cambrian Geology and Paleontology. Ill, No. 5. Cambrian trilobites. By 

 Charles D. Walcott. In press. 



Volume 65. 



No. 3. A study of the radiation of the atmosphere. Based upon observations of 

 the nocturnal radiation during expeditions to Algeria and to Cali- 

 fornia. By Anders Angstrom. Hodgkins Fund. August 27, 1915. 

 159 pp. (Publ. 2354.) 



No. 6. Explorations and field work of the Smithsonian Institution in 1914. July 

 1, 1915. 95 pp., 1 pi. (Publ. 2363.) 



No. 9. Arequipa pyrheliometry. By C. G. Abbot. Hodgkins Fund. March 1, 

 1916. 24 pp. (Publ. 2367.) 



No. 10. A phylogenetic study of the recent crinoids, with special reference to the 

 question of specialization through the partial or complete suppression 

 of structural characters. By Austin H. Clark. August 19, 1915. 67 pp. 

 (Publ. 2369.) 



No, 11. A magneton theory of the structure of the atom. By A. L. Parson. 

 November 29, 1915. 80 pp., 2 pis. (Publ. 2371.) 



No. 12. The jaw of the Piltdown Man. By Gerrit S. Miller, jr. November 24, 

 1915. 31 pp., 5 pis. (Publ. 2376.) 



No. 13. Descriptions of seven new subspecies and one new species of African 

 birds (Plantain-Eater, Courser, and Rail). By Edgar A. Mearns. 

 November 26, 1915. 9 pp. (Publ. 2378.) 



No. 14. The sense organs on the mouth parts of the honey bee. By N. E. Mclndoo. 

 January 12, 1916. 55 pp. (Publ. 2381.) 



Title-page and table of contents. June 17, 1916. v pp. (Publ. 2419.) 



Volume 66. 



No. 1. Descriptions of a new genus and eight new species and subspecies of 

 African mammals. By N. HoUister. February 10, 1916. 8 pp. 

 (Publ. 2416.) 



