SEPTEMBER 29, 1899. ] 
resistance coils absorbing moisture from the 
atmosphere, and also to the effects of ca- 
pacity around the fine wire coil of a Watt- 
meter. 
The full program was as follows : 
1. Apparatus for the demonstration of the varying 
currents in the different conductors of a rotary con- 
verter. F.C. Caldwell, Columbus, O. 
2. A new graphical method of constructing the en- 
tropy-temperature diagram from the indicator card of 
a gas or oil engine. H. T. Eddy, Minneapolis, Minn. 
Trans. Am. Soc. Mech. Eng. 
3. Compound harmonic vibration of a string. W. 
Hallock, New York, N. Y. ScrENCE. 
4. A new form of electrical condenser, having a ca- 
pacity capable of continuous adjustment. Lyman J. 
Briggs, Washington, D. C. 
5. Relations of time and space in vision. J. McK, 
Cattell, New York, N. Y. Psychological Review. 
6. Time of perception as a measure of the intensity 
of light. J. McK. Cattell, New York, N. Y. Psycho- 
logical Review. 
7. The musical scales of the Arabs. 
Wead, Washington, D. C. 
8. Medieval organ pipes and their bearing on the 
history of the scale. Charles K. Wead, Washington, 
D.C. ‘ Music,’ Chicago. 
9. Electrical anesthesia. 
Haven, Conn. 
10. An absolute determination of the E.M.F. of a 
Clark cell. H.S. Carhart and K. E. Guthe, Ann Ar- 
bor, Mich. Physical Review. 
11. Quantitative investigation of the coherer. Au- 
gustus Trowbridge, New Haven, Conn. Am. Jour. 
Sci., Sept., 1899. 
12. Polarization and polarization capacity of an 
electrolytic cell. K. E. Guthe and M. D. Atkins, 
Ann Arbor, Mich. Physical Review. 
13. Current and voltage curves in the magnetically 
blown are and in the aluminum electrolytic cell. 
Reginald A. Fessenden, Allegheny, Pa. 
14. Some new apparatus—tachometer, chrono- 
graph, data collector, induction coil, balance for 
standardizing amperemeters, standard of induction. 
Reginald A. Fessenden, Allegheny, Pa. 
15. Measurement of magnetism in iron and the re- 
lation between permeability and hysteresis. Regi- 
nald A. Fessenden, Allegheny, Pa. 
16. Polarization and internal resistance of the cop- 
per voltameter. B.E. Moore, Lincoln, Nebr. Physical 
Review. 
17. Concerning the fall of potential at the anode in 
a Geissler tube. C. A. Skinner, Lincoln, Nebr. 
Wiedemann Annalen. 
Charles K. 
E. W. Scripture, New 
SCIENCE. 
441 
18. The equipment and facilities of the Office of U. 
S. Standard Weights and Measures for the verifica- 
tion of electrical standard and measuring apparatus. 
F. A. Wolff, Jr., Washington, D. C. 
19. An experimental test of the accuracy of Ohm’s 
law. F. A. Wolff, Jr., Washington, D. C. 
20. March weather in the United States. 
Fassig, Baltimore, Md. Am. Jour. Sct. 
21. A new spectrophotometer and a method of op- 
tically calibrating the slit. D. B. Brace, Lincoln, 
Nebr. 
22. On achromatic polarization in crystalline com- 
binations. D. B. Brace, Lincoln, Nebr. 
23. On the nature of electricity and magnetism and 
a determination of the density and elasticity of the 
ether. Reginald A. Fessenden, Allegheny, Pa. SctI- 
ENCE. Read in joint session with Section A. 
24. Advancesin theoretical.meteorology. Cleveland 
Abbe, Washington D. C. Read by title. 
25. Location of smokeless powder discharge by 
means of colored screens. Reginald A. Fessenden, 
Allegheny, Pa. 
26. A method for the study of phosphorescent sul- 
phides. Fred E. Kester, Columbus, O. Physical 
Review. 
27. Accidental double refraction in colloids and 
crystalloids, B. V. Hill, Lincoln, Nebr. Philosophical 
Magazine. 
28. Note on the age of the earth. 
Fessenden, Allegheny, Pa. 
29. A bolometric study of the radiations of a black 
body between 600° C. and 1100°C. C. E. Menden- 
hall, Williamstown, Mass. Astrophysical Journal. 
30. A bolometric study of the radiations of an ab- 
solute black body. IF. A. Saunders, Haverford, Pa. © 
Astrophysical Journal. 
31. On thermodynamic surfaces of pressure-vol- 
ume-temperature for solid, liquid and gaseous state. 
F. E. Nipher, St. Louis, Mo. Trans. St. Louis Acad. 
Sci. Read by title. 
32. On the escape of gases from the planets accord- 
ing to the kinetic theory. S. R. Cook, Lincoln, Nebr. 
Astrophysical Journal. 
33. On differential dispersion in double refracting 
media. E. J. Rendtorff, Lincoln, Nebr. 
34. Relation of magnetization to the modulus of 
elasticity. J. S. Stevens, Orono, Me. Physical Review. 
35. On flutings in the Kundt sound tube. S. R. 
Cook, Lincoln, Nebr. Philosophical Magazine. 
36. Dielectric strength of oils. Thomas Gray, ‘Terre 
Haute, Ind. 
37. Some unexpected errors in watt-meter measure- 
ments. Terre Haute, Ind. 
38. Note on the preparation of reticles. 
Todd, Amherst, Mass_ Read by title. 
O. L. 
Reginald A. 
David P. 
