338 Miscellaneous Intelligence. 



D. P. Todd: Meteorological observations made in April, 1890, 1891, 1892, in 

 the totality-path of the eclipse of 1893. April 16. 



L. A. Bauer: The secular motion of a free magnetic needle. 



M. Merriman: On the discriminators of the discriminant of an algebraic 

 equation. 



G. E. Hale: The spectroheliograph of the Kenwood Astro-Physieal Observa- 

 roiy. Chicago, and results obtained in the study of the sun. Forms of solar 

 faculce. 



C. L. Doolittle: Latitude of the Sayre Observatory. List of 30 new proper 

 motion stars. 



Alexander Macfarlane: On the imaginary of algebra. 



R. S. Woodward : The iced-bar base apparatus of the U. S. Coast and Geo- 

 detic Survey. On the general problem of least squares. 



A. W. Phillips: Models and machines for showing curves of the third 

 degree. 



T. H. Safford : Least square fallacies. Differential formula? for orbit cor- 

 rections. Proper motion of 89 stars within 10° of the north pole, with remarks 

 on the present state of the problem of the "solar motion. 



E. Hastings Moore : Concerning a congruence-group of order 360 contained 

 in the group of linear fractional substitutions. 



W. Hoover: On the intersection of an equilateral hyperbola and the sides of 

 a plane triangle — a-question in trilinears. 



W. A. Rogers : On the construction of a prime vertical transit instrument 

 for the determination of the latitude of Harvard College Observatory. 



A. S. Hathaway: Lineo-lmear vector functions. 



E. B. Frost : Thermal absorption in the solar atmosphere. 



J. E. Kershner: Electric lights for astronomical instruments. 

 .J. D. Warner : Practical rules for testing whether a number is divisible by 7, 

 or any other small prime ; and if not divisible, to ascertain the remainder. In- 

 crease in constant for addition in testing for integral values in the equation of 

 quarter squares. 



Section B. Physics. 



E. S. Ferry : Persistence of vision. 



G. W. Holley: Experiments on the ocular spectrum of the eye and the 

 image presented to the brain. 



C. A. Oliver: Description of a contrivance intended for the study of percep- 

 tion at definite distances. 



E. Merritt : Note on the photography of the manometric flame and the 

 analysis of vowel sounds. 



G. W. Hough: On the sensitiveness of photographic plates. 



W. S. Franklin : E. M. F. between normal and strained metals in voltaic 

 cells. 



M. Merriman : Influence of the moon on the rainfall. 



D. P. Todd : On the mechanical and physical means of aerial transit without a 

 propeller. 



E. B. Rosa : Further experiments on the specific inductive capacity of elec- 

 trolytes. 



C. B. Thwing: A photographic method of mapping the magnetic field. 



F. P. Whitman : Constancy of volume of iron in strong magnetic fields. Note 

 on magnetic disturbances caused by electric railways. 



E. L. Nichols : The distribution of energy in the spectrum of the glow-lamp. 

 Absorption spectra of certain substances in the infra-red. 

 J. E. Oliver: Note on the Lesage-Thomson theory of gravitation 



A. E. Dolbear: A mechanical model of electromagnetic relations. 



W. L Stevens : An experimental comparison of formula? for total radiation 

 between 15° C. and 110° C. 



H. Rubens and B. W. Snow: On the dispersion of radiations of great wave- 

 lengths in rock salt, silvite and fluorspar. 



B. W. Snow : On the distribution of energy in the arc. On the infra-red 

 spectra of the alkalies. 



G. Hinrichs: On the mechanics of the three states of aggregation. 



