September 1, 1922] 



SCIENCE 



261 



Some Blaak Siver irachiopods from Ihe Missis- 

 sippi Valley: Carroll Lane Fenton and Mil- 

 dred Adams Fenton. 



Oil prospects in Iowa: John E. Smith. 



The Rochford geodes: Sidney L. Galpin. 



, mathematics 



IOWA SECTION, mathematical ASSOCIATION OP 

 AMERICA 



The method, of averages: G. W. Snedecok. 



Mathematical hulletins : T. M. Blakeslee. 



Topics in general analysis: E. W. Chittenden. 



The place of the equation in a scheme of edu- 

 cation: C. W. "Wester. 



Pre-symmetric determinants whose elements 

 are finite sums : E. E. Smith. 



On the meaning of the classification of statis- 

 tical series hy means of the Lexis ratio: H. L. 



BlETZ. 



Definitions of imaginary and complex numbers: 

 E. S. Allen. 



An extension of the figurate mimhers: J. F. 

 Reillt. 



PHTSICS 



A redetermination of the principal reflecting 

 poioers of isolated selenium crystals: L. P. Sieg. 



Solubility .and polarity: William Kunerth. 



A comparison of intensities required under 

 direct and under indirect lighting systems: Wil- 

 liam Kunerth. 



Coefficients of diffusion of salt vapors in the 

 Bunsch flame: George E. Davis. 



The path of a rigid electron which moves in a 

 magnetic field of constant strength rotating with 

 constant angular 'velocity: E. 0. Hulburt. 



Phenomena in gases excited by radio frequency 

 current's: E. O. Htjlburt. 



The broadening of the Palmer lines of hydro- 

 gen v;ith pressure: E. O. Hulbtjrt. 



Nodal distances in acoustics : G. W. Stewart. 



A variable single band acoustic filter: G. W. 

 Stewart. 



A new form of telephone receiver and trans- 

 mitter: C. W. Hewlett. 



The scattering of X-rays by light elements: 

 C. W. Hewlett. 



TIte attenuation factor in acoustic wave filters: 



H. B. JpEACOCK. 



The Hall effect and specific resistance of evap- 

 orated films of silver, copper and iron: J. C. 

 Steinberg. 



Effect of automobile headlight lenses by box 

 photometer method: D. M. Smith. 



zoology 

 Iowa microlepidoptera: A. W. Lindsey. 



Brood "A" of the white grub extends its 

 range in Iowa: H. E. Jaques. 



A study of the eggs of the white-marlced tus- 

 sock moth: Miss Susannah Poulter and H. E. 

 Jaques. 



A scribofacilograph for labelling Tcymographic 

 tracings: T. L. Patterson. 



Effects of stretch on smooth muscle responses: 

 B. M. Harrison. 



Observations on the habits of a tarantula in 

 captivity: Albert Hartzell. 



Some recently published errors respecting the 

 cranial nerves of the dogfish: H. W. Norris. 



Cranial nerve components in Am,ia, Lepidosteus, 

 Polyodon and Scaphirhynchus : H. W. Norris. 



Morphological studies on the injury to apple 

 caused by Ceresa bubalis: J. C. Goodwin and 

 F. A. Fenton. 



Some hereditary pathogens : W. E. Sanders. 



So7ne notes on Empoasca flaviscens: E. L. 

 Webster. 



Simultaneous fast and sloiv drum records of 

 fatigue: F. M. Baldwin. 



Nest-digging and egg-laying habits of Bell's 

 turtle: Frank A. Stromsten. 



Notes on some of the rarer birds of the Ames 

 region: H. E. EwiNG. 



Bird records of the past two winters, 1920- 

 1922, in the upper Missouri valley: T. C. Ste- 

 phens. 



Sociology as a science: Hornell Hart. 



Chance in development as a cause of variation: 

 P. W. Whiting. 



Criteria of superior intelligence: Keuel H. 

 Sylvester. 



The mental and physical status of children 

 entering the public schools: J. E. Evans. 



Behavior of trapped and banded birds: Dayton 

 Stonbr. 



botany 



A comparative study of the common and red- 

 seeded dandelions: Miss June Berry. 



Some influences of the submarginal vein in 

 leaves: Egbert B. Wylie. 



The sperms of Vallisneria spiralis: Robert B. 

 Wylie. 



Types of wound healing in certain foliage 

 leaves: Egbert B. Wylie. 



Morphology of the vein-islet in certain dicoty- 

 ledons: Sara I. Lewis. 



Bud characters of native trees of Jasper 

 County, Iowa: F. P. Sipe. 



Ihe American Lotus : L. H. Pammel. 



Some observations on the plants of the Sierras: 

 L. H. Pammel. 



