ANNOUNCEMENTS OF MEETINGS OP THE ACADEMY AND. 



AFFILIATED SOCIETIES 



Saturday, February 19. The Biological Society, at the Cosmos Club, at 

 8 p.m. 



Wednesday, February 23. The Geological Society, at the Cosmos Club, 

 at 8 p.m. Program: 



F. E. Matthes: Torrent channels and torrent levees in the Yosemite Valley. 

 Sidney Paige : Structure of the Homestake ore body. 



G. R. Manspield: Igneous geology of southeastern Idaho. 



Thursday, February 24. The Chemical Society, at the Interior De- 

 partment, at 8 p.m. 



Saturday, February 26. The Philosophical Society, at the Cosmos 

 Club, at 8.15 p.m. Program: 



C. LeRoy Meisinger: The meteorological factor in aeronautics. 



L. H. Adams and E. D. Williamson: The density of "strained" glass. 



G. T. Rude : TJie tidal work of the U. S. Coast and Geodetic Survey. 



Tuesday, March 1. The Botanical Society. 



Wednesday, March 2. The Society of Engineers. 



Thursday, March 3. The Entomological Society. 



PROGRAMS ANNOUNCED SINCE THE PRECEDING ISSUE OF THE JOURNAL* 



Tuesday, February 1. The Botanical Society, at the Cosmos Club, at 8 p.m. Program: 

 H. L. Shantz: Natural vegetation of Africa. Ivar Tidestrom: Notes on the flora of 

 the Iberian peninsula. 



Wednesday, February 2. The Society of Engineers, at the Cosmos Club, at 8.15 p.m. 

 Program : T. T. Craven : Naval aviation; the present sitiiation and prospective future 

 developments. 



Thursday, February 3. The Entomological Society, at the National Museum, at 8 p.m. 

 Program: R. C. Shannon: Notes on classification of Syrphidae, E. D. Ball: Food 

 plants and adaptation of tree hoppers. I,. O. Howard : Extract from Fenlon's review of 

 Fabre's work. 



Saturday, February 5. The Biological Society, at the Cosmos Club, at 8 p.m. Program: 

 Ivar Tidestrom: Notes on the flora of the Iberian peninsula. R. S. Bassler: Paleon- 

 tological work at the National Museum. 



Thursday, February 10. The Chemical Society, at the Cosmos Club, at 8 p.m. 

 Program: Synposium on fertilizers. W. D. Hurd: The present American fertilizer 

 industry. F. W. Brown: The potash situation. W. H. WAGGAMAtj: ^Phosphates and 

 phosphoric acid production. D. P. Gaillard: Nitrogen resources, possibilities and 

 requirements. O. Schreiner: Fertilizer utilization. R. O. E. Davis: Concentrated 

 chemical fertilizers. 



Thursday, February 17. The Academy, at the Cosmos Club, at 8.15 p.m. Program : 

 !,• O. Howard :~ How the Government is fighting insects. 



. * Notices received too late for publication before the date of the meeting. 



