Chemistry and Physics. 163 
deduction, so that a more detailed analysis of the work is un- 
necessary in this place; but there is one point of especial 
interest to which I would like to call attention, and that is the 
secular equation of the longitude which depends on the 
quantity in the expression of the earth’s disturbing force, it 
seems strange that Mr. Hill should have entirely overlooked 
one of its most obvious consequences. 
re roueh the defect to which I have called attention renders 
wee work of no value as a scientific deduction, 1t 1s never- 
ebay really valuable on account of the elegance and sym- 
: y which pervades its vast expansion ; and it may be 
xamined with great advantage by the matured mathemanician 
as well as by the younger student of celestial mechanics. 
Cleveland, Nov. 8, 1884. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PHYSICS. 
& 
cathetometer e evaporation wae fo 
used ometer. In order to determine the density of the liquids 
sey at their boiling points, a specific gravity flask filled with th 
me was placed in a cylinder containing the same liqui 
cena hen the liquid had reached the required tempera- 
* This Journal, III, xxvii, 233, March, 1884. 
