SOS, 13 

 F\SZ 



GENERAL INDEX 



mi* m 



OF 



VOLUMES XL1-L OF THE FOURTH SERIES 



IW In the references, heavy-faced type is used for the numbers of the volumes. 



Note. — The names of minerals are inserted under the head of Minerals ; all obituary notices are 

 referred to under Obituary. Under the heads Botany and Botan. Works, Chemistry and Chem. 

 Works, Geology, Rocks, Zoology, the references to the topics in these departments are grouped 

 together ; in many cases the same references appear also elsewhere. 



Initial capitals are in general used for the titles of books noticed. 



Abajo Mts., Utah, geology, Thorpe, 



48, 379- 



Abo Sandstone, New Mexico, Bose, 



49, 51. 



Academies, National, Hale, 41, 225. 

 Academy of Sciences, French, 45, 

 242. 



— National, Meeting at Baltimore, 

 1918, 46, 772; Boston, 1916, 42, 

 506; New Haven, 1919, 48, 402, 

 478; Philadelphia, .1917, 44, 487; 

 Princeton, 1920, 50, 473; Wash- 

 ington, 1916, 41, 469; 1917, 43, 

 495; 1918, 45, 479; 1919, 47, 3o8, 

 451; 1920, 49, 387, 453. 



Accelerations, direct determina- 

 tion, Galitzin, 48, 394. 



Accumulator, lead, Fery, 42, 366. 



Achromatoscope, Williams, 41, 101. 



Acoustics, lecture experiments, 

 Kayser, 49, 446. 



Adelie Land, metamorphic rocks, 

 Stillwell, 47, 388. 



Adirondack Pre-Cambrian, Ailing, 

 48, 47- 



Aeronautics, 48, 249. 



Agar, W. E., Cytology, 50, 77- 



Agelacrinitid, from the Chazy of 

 New York, Clark, 50, 69. 



Air Propeller, Bedell, 49, 216. 



— thermal conductivity, Hercus 

 and Laby, 47, 299. 



Airplane Characteristics, Bedell, 



46, 691. 

 Alabama, Cretaceous Hymensea 



from, Berry 47, 65. 



— geol. survey, 44, 158. 



Alaska, Paleozoic glaciation, Kirk, 

 46, 511. 



— Pribilof Is., geological notes, 

 Hanna, 48, 216. 



Alberta, geology, Stewart, 49, 83. 



Alcock, F. J., Athabaska Series, 50, 

 25. 



Alcohol, Flint, 48, 247. 



Alexander, J., Colloidal Chemistry, 

 48, 160. 



Alexander, P. F., Northwest and 

 Northeast Passages, 41, 471. 



Alexander, W. B., Prickly Pear, 48, 

 475- 



Algae, Pre-Cambrian, etc., Twen- 

 hofel, 48, 339. 



Allan, J. A., titaniferous augite, 43, 

 75- 



Allegheny Observatory. See Ob- 

 servatory. 



Allen, E. T., composition of bor- 

 nite, 41, 409; determination of 

 dissociation pressures of sul- 

 phides, 43, 175. 



Allen's Commercial Organic Analy- 

 sis, Davis, 44, 400. 



Ailing, H. L., Adirondack graphite 

 deposits, 47, 145; Adirondack 

 Pre-Cambrian, 48, 47. 



Alpha particles, retardation by 

 metals, Vennes, 44, 69. 



from thorium, Rutherford, 



41, 56i. 



Alsace, potash from, Kestner, 47, 

 68. 



