P. E. Chase on influence of Gravity on Magnetic Declination. 83 
Art. XI.—Jnfluence of Gravity on Magnetic Declination ;* by 
Puiny Earue Cuasz, M.A., S.P.A:S. 
IN my first communication on the diurnal variation of the 
barometer, [Proceedings A. P.S., ix, 284], I expressed the belief 
that a careful investigation would “show a mutual connection 
through which al! the secondary [disturbing] causes may be 
referred to a single force.” In my various subsequent papers, 
and especially in the one to which the Magellanic Premium was 
awarded, [op. citat. and Trans. A. P.S., vol. xiii, N.S., Art. VI], 
I pointed out various reasons for supposing that the primal uni- 
tary force is the same that controls the motions of the several 
stellar systems; in other words, the force of gravitation, or per- 
haps of simple undulation, which is manifested as heat in one 
of its subordinate forms, and as attraction in another. e 
numerical relations which I demonstrated between the disturb- . 
ances of weight and of total magnetic force were certainly note- 
worthy, and to my own mind, extremely satisfactory, and as 
further investigations have afforded additional confirmation of 
my views, I desire to put upon record a brief notice of the gen- 
eral harmony which mutually characterizes the gravitation cur- 
rents and the variations of magnetic declination. 
Preliminary investigations showed, as might have been 
Teasonably anticipated, that the best quantitative results can be 
obtained from the observations at stations near the equator, and 
I therefore based my reasoning in great measure upon the t. 
elena records and Maj. Gen. Sabine’s discussions, confirming it 
by such incidental references to other observations, as seeme 
available for the purpose. At the same time allusion was made 
rans. A. P.§., loc. citat., p. 182,] to researches now in progress, 
which may probably enable us to discover numerical relations, 
that will “be equally satisfactory, from an examination of the 
corroboration of my own views and as a guide to the investiga- 
tions of others. 
” From the Proceedings of the Amer. Philosoph. Soc., April 21, 1865. — 
