September 30, 1921] 



SCIENCE 



309 



noose formation at Mystic, Iowa, and is said to 

 have been taken from a shale just below a coal 

 seam at a depth of fifty to sixty feet. The type 

 of this species and one or two other examples 

 came from the Pennsylvanian of Kansas; others 

 are recorded from Arkansas; the specimen here re- 

 ported is the first from Iowa. Illustrations. 



Some OUgocene BracMopods from the Island of 

 Antigua, B. W. I.: A. O. Thomas. In the An- 

 tigua limestone at Half Moon Bay, Antigua, there 

 occurs an abundance of lepidocycline f oraminifera, 

 a number of sea-urchins, some corals, pelecypods, 

 a few gastropods, and rarely some brachiopods be- 

 longing to the genera Argyrotheca, Terebratulina, 

 and Liothyrina. They appear to be new species 

 though the Liothyrinas are close to those reported 

 by Guppy from Trinidad over fifty years ago. 

 These small forms have added interest since very 

 little is known about the brachiopods of the Ameri- 

 can Oligocene. 



Note on a heaver tooth from the Pleistocene at 

 Des Moines, Iowa: A. 0. Thomas. The specimen 

 is an incomplete incisor tooth of the giant beaver, 

 Castoroides ohioensis Foster. It was found by 

 Mr. B. A. Wickham in gravels of uncertain age 

 whQe making an excavation near the west city 

 limits. This is the third locality record from 

 Iowa, the others being Turin and Oakland. Illus- 

 tration. 



Some proboscidean remains found in Henry 

 county, Iowa: H. E. Jaques. 



The loess fossils of western Tennessee: B. 

 Shimek. 



physics and astronomy 



A laboratory optical pyrometer: Notes on its de- 

 sign and operation: Wm. Schriever. 



(1) Measurements of the amplitude of vibration 

 of the diaphragm of the Hewlett tone generator. 

 (2) Determination of the minimum audible inten- 

 sity of tones of high frequency: Clarence E. 

 Lane. 



A low frequency acoustic wave filter: G. W. 

 Stewart. 



(1) The effect of drawing on the crystal struc- 

 ture of tungsten wires. (2) A note on Kater's 

 reversible pendulum: L. P. Sieg. 



The coefficient of rigidity, and Young 's modulus 

 for hexagonal crystals of selenium: L. P. Sieg and 

 E. P. Miller. 



The absorption of light passing through deep 

 slits, as a function of the length and depth of the 



slits and of the wave length of the light: L. P. 

 Sieg and A. T. Pant. 



Tlie tactual analogy of stroboscopy : L. B. Dodd. 



Scattering of X-rays in carbon: C. W. Hew- 

 lett. 



A new loud speaTcing telephone receiver: C. W. 

 Hewlett. 



Hall effect in thin films: J. C. Steinberg. 



The Alpha lines in the "K" series tungsten 

 spectrum: Charles Crofutt. 



A note on Nova Cygni, No. S: D. W. More- 

 house. 



Beview of solar observations at Alta, Iowa, dur- 

 ing the past thirteen years, 1908-1920: David E. 

 Hadden. 



A study of the nesting habits of the Baltimore 

 oriole: H. E. Jaques and Katherine Gilmoee. 

 Nactarina in the United States: Prank C. Pel- 



LETT. 



Corn oil cake meal for growing and fattening 

 pigs: John M. Eward. 



Notes on the mammals observed in Marshall 

 county, Iowa: Ira N. Gabrielson. 



Bird banding and incidental studies: D.\yton 

 Stoner. 



Burrows and burrowing liabits of the common 

 mole: A. V. Arleton. 



Some observations on certain Cladocera: Prank 

 A. Stromsten. 



Alcohols as factors altering fatigue processes 

 in frog muscle: Prancis M. Baldwin. 



Analysis of certain smooth muscle responses: B. 

 M. Harrison and Francis M. Baldwin. 



Notes on the differential viability in Gamibusia: 

 S. W. Geiser. Author presents evidence to show 

 that in the shipment of Gam,busia affinis, the com- 

 mon mosquito fish, the males have a higher death 

 rate than the females, both in winter and summer 

 shipments. He shows by experiments that this 

 higher death-rate is not due to warming of the 

 water in the shipping can, but is owing to other 

 causes. The male death-rate in warm weather ship- 

 ments is much higher than that of those sent in cold 

 weather; in the females, there is no corresponding 

 increase in the death-rate. He combats the evidence 

 brought forward (1921) by Barney and Anson to 

 show a higher death-rate among the females in 

 shipments of Gambusia. 



