152 
cell and in the magnetically blown are ; Method 
of locating point of discharge of smokeless 
powder by colored screens: Reginald A. Fes- 
senden, Western University of Pennsylvania, 
Allegheny, Pa. 
Polarization and polarization capacity: Karl 
E. Guthe and A. D. Atkins, University of 
Michigan, Ann Arbor, Mich. 
Accidental double refraction in colloids and 
crystalloids: B. V. Hill, University of Ne- 
braska, Lincoln, Nebr. 
A method for the study of phosphorescent 
sulphides: Fred. E. Kester, Ohio State Uni- 
versity, Columbus, O. 
Simple science work for common schools : H 
B. Mathews, Agricultural College of South Da- 
kota, Brookings, 8. D. 
Pressure and wave-length: John Fred Mohler, 
Dickinson College, Carlisle, Pa. 
On the effect of concentration series in the 
copper voltameter : B. E. Moore, University of 
Nebraska, Lincoln, Nebr. 
On the coincidence of the two refracted rays 
in biaxial crystals: L. T. More, University of 
Nebraska, Lincoln, Nebr. 
Thorium radiations: R. B. Owens, McGill 
University. 
On differential dispersion in double refract- 
ing media: E. J. Rendtorff, University of Ne- 
braska, Lincoln, Nebr. 
A new voltage regulator: Geo. D. Shepard- 
son, Granville, O. 
The relation between magnetism and the 
elasticity of rods—and some S. H. M. curves: 
James S. Stevens, University of Maine, Orono, 
Me. 
Note on the preparation of photographic reti- 
cles: David P. Todd, Observatory House, Am- 
herst, Mass. 
The equipment and facilities of the office of 
the U. §. standard weights and measures for 
the verification of electrical standards and 
measuring apparatus; An experimental test of 
the accuracy of Ohm’s law: Frank A. Wolfe, 
Jr., U. S. Coast and Geodetic Survey, Wash- 
ington, D. C. 
SECTION F—ZOOLOGY. 
ZEstivation of Epiphragmorphora traskii (New- 
comb) in S. California: M. Burton William- 
son, Los Angeles, Cal. 
SCIENCE. 
[N.S. Von. X. No. 240. 
Natural taxonomy of the class Aves: R. W. 
Shufeldt, Takoma Park, D. C. 
Notes on the morphology of the chick’s 
brain : Susanna P. Gage, Ithaca, N. Y. 
Further notes on the brook lamprey (Lam- 
petra wilderi): Simon H. Gage, Cornell Uni- 
versity, Ithaca, N. Y. 
Respiration in tadpoles of the toad (Bufo 
lentiginosus) : Simon H. Gage. 
Photographing natural history specimens 
under water or other liquids with a vertical 
camera: Simon H. Gage. 
Hybrid butterflies of the genus Basilarchia : 
William L. W. Field, Milton, Mass. 
On some piratine bugs which may be respon- 
sible for so-called ‘spider-bite’ cases: L. O. 
Howard, Department of Agriculture, Washing- 
ton, D. C. 
Observations on the development of mam- 
mals: Charles 8. Minot, Harvard University, 
Cambridge, Mass. 
The correct systematic position of the Spong- 
idx in Zoology : W. R. Head, Chicago, II. 
Have we more than a single species of Blissus 
in North America? F. M. Webster, Wooster, 
Ohio. 
On the utility of phosphorescence in deep- 
sea animals: C. C. Nutting, University of 
Iowa, Iowa City, Ia. 
On the criteria for interpreting the psychol- 
ogy of animals: C. C. Nutting. 
A discussion of Aspidiotus cydonie and its 
allies: C, L. Marlatt; Washington, D. C. 
Temperature control of scale insects: C. L. 
Marlatt. 
SECTION I—SOCIAL AND ECONOMIC SCIENCE 
The psychological value of statistics: Car- 
roll D. Wright, Washington, D. C. 
[Title to be announced]: Edmund J. 
James, Chicago University. 
Some new aspects of educational thought: 
Thomas M. Balliet, Springfield, Mass. 
The basis of war and peace: M. A. Clancy, 
Washington, D. C. 
Business cooperation: N. 
Louis, Mo. 
Thoughts on education from the standpoint 
of Porto Rico: John Eaton, Washington, D. C. 
Some thermal determinations in the heat- 
O. Nelson, St. 
