INDEX. 



Acoustic Impede nee and its Measure- 

 ment, 503. 



Acoustics, Architectural, Sabine's 

 Method in, without the Use of 

 the Ear, 491. 



Agassiz, G. R., appointed Chairman 

 of House Committee, 486; re- 

 port of the House Committee, 

 499. 



Allen, G. M., resigns Fellowship, 484. 



American Council of Learned Socie- 

 ties devoted to Humanistic Stud- 

 ies, 484, 486, 489. 



Ammonia, Specific Heat of, 323, 487. 



Amory (Francis) Fund, 494. 



Assessment, Annual. 500. 



Aurora, A possible cause of the, 

 through the action of the wind 

 in a magnetic field, 487. 



Babcock, H. A., Specific Heat of 

 Ammonia, 323, 487. 



Barrois, Charles, accepts Foreign 

 Honorary Membersliip, 483. 



Battle Casualties, Some of the Prob- 

 lems of the Neuro Surgeon aris- 

 ing from, 485. 



Bauer, L. A., Observations of the 

 Total Solar Eclipse, May 29, 

 1919, 487. 



Beal, Boylston A., gift of painting by 

 Tilton, 491. 



Biographical Notices, 505; Standing 

 Committee on, 488, 490, 501. 



Blanchard, A. A., accepts Fellowship, 

 483. 



Boulenger, G. A., A Monograph of 

 the American Frogs of the Genus 

 Rana, 411, 489. 



Bovie, W. T., elected Fellow, 503. 



Brent, C. H., accepts Fellowship, 484. 



Brewster, William, death of, 483. 



Brown, H. N., accepts Fellowship, 

 483. 



Carrel, Alexis, accepts Fellowship, 



486. 

 Carter, Franklin, death of, 487. 



Cathedrals, French and English, 

 Stained Glass Windows of, 485. 



CauUery, Maurice, elected Foreign 

 Honorary Member, 503. 



Clark, B. P., elected Fellow, 503. 



Clark, W. E., elected Fellow, 503. 



Compositae, On tropical American, 

 chiefly Eupatoriae, 1. 



Council, Report of, 492. 



Cross, C. R., Report of the Rumford 

 Committee, 496. 



Cryptogamic Laboratory of Harvard 

 University, Contributions from, 

 209. 



Gushing, Harvey, Some of the Prob- 

 lems of the Neuro-Surgeon aris- 

 ing from Battle Casualties, 485. 



Daly, R. A., The Deep Sea Islands 

 of the Pacific, 490. 



Davis, A. M., death of, 491. 



Davis, W. G., death of, 483. 



Derr, Louis, appointed Chairman of 

 Publication Committee, 484; re- 

 port of Pubhcation Committee, 

 498. 



Dillon, T. H., elected Fellow, 503. 



Dimorphomyceteae, New, 209. 



Dixon, R. B., Western Thibet and the 

 development of Central Asia, 

 488. 



Drinker, C. K., elected Fellow, 503. 



Dynamics, Some Geometric Investi- 

 gations on the General Problem 

 of, 283, 489. 



Ear, Sabine's Method in Architectural 



Acoustics without the Use of 



the, 491. 

 Economic Revolution, The, now in 



Process, 492. 

 Edes, H. H., Report of the Treasurer, 



492. 

 Edgerton, Franklin, elected Fellow, 



503. 

 Electricity, Nature's, Progress in 



Knowledge of, 484. 



