82 Miscellaneous Intelligence. 
wishes to use but one micrometer-screw. Gauss’s modification of 
Bessel’s method for determining the focal eS of the object- 
glass should have been given, because it is one of the very best 
methods of determining the value of the bassin of the micro- 
meter-screw; and most observers would have liked to have some- 
thing about the different eye- es achromatic and otherwise, 
made by Steinheil, Clark and others. 
The working out of orbits iy both the graphical and analytical 
methods is an excellent feature, and it would be difficult to im- 
a on the arrangement of the catalogue and measures. 
Double Star Observations made in 1877-8 at Chieago with 
the 183- inch Refractor of the Dearborn Observatory, comprising, 
I, @ Catalogue of 251 new abe stars with measures, an . 
Miorombvical measures of 500 double stars ; by 8S. W. Burynam, 
M.A. From the Memoirs of the Royal Astronomical Society, 
vol. xliv.—Mr. Burnham’s Memoir was received too late for a 
notice. It bears testimony to his eed. Lbcepaah au energy as 
an astronomical observer. His observations make an important 
part of the Handbook of Double Stars, a notic eae 
4. Solar Light and Heat, the Source and the Su upply: Gravita- 
tion: with py eae te of Planetary and Molecular Forces; by 
Zacwarian Aten, LL.D, 241 PP. 8vo. New York, 1879. (Ap- 
pleton & Co.)—T his is a sequel to the work published by the 
motion the moving force which comes Pe us as light and heat. 
ah is brivis to be expected that his views will be accepted by 
physici 
fe OBITUARY. 
Professor B. F. Mupex.—Professor Mudge died at his resi- 
dence, in Manhattan, ansed, suddenly, on the 21st of November, 
of apoplexy. Professor Mudge was the State Geologist of Kansas. 
Only a few months since—last September—his Report on the Geol- 
oBy of Kansas was noticed in this Journal. Professor Mudge was 
man of great industry in his favorite science, and made large col- 
ipbtionis ot fossils, which were, however, sent to others to describe. 
as Emeritus Protea: died at the re ee of his son at pen 
Staten Island, Dec ember Ist , 1879, in his 74th year. He w 
conscientious and successful teacher of science, and papers by bist 
on mineralogical and physical subjects will be found in the earlier 
volumes of this Journal. 
