The nett No. of this Journal will be published on the first of May. 
CONTENTS. 
% ; Page. 
On the ee ; by Prof. J. Locka - -« 153 
‘he eee of Trap dikes: in ran” ie alge an evi- 
bs 158 | 
oe es, of f North Asiatic: by der. 
Be EXKELEY, of — and Rey. M. A. Curtis, of 
South Carolina, = - ae 
X. Connection between the Riseale weight ‘tail thé shies . on 
and chemical properties of Barium, Strontium, Calcium and . 9 
Magnesium, and some of their a : by Professor eg 
E. N. Horsrorp, 176 : 
XXI. On the American ela Meridian : ; by Prof "J Teen 184 
XXII. On Perfect Musical Intonation, and the fundamental Laws 
of Music on which it depends ; with remarks showing the — 
areas of attaining this Perfect Intonation in the Or- 
gan; by Henry Warp Poot, - - 199 
| XXL On the new American Mineral, Piseaenic ; by Pro- 
fessor B. Sizuiman, Jr., - ‘ é ‘ 16 
XXIV. Table of Atomic Weights, -- . - 21 
XV. On the Isomorphism and Atomic Volare of some . Min- 
étals; by James D. Dana, — - - 20 
XXVI., _ Observations on the Size of the ‘Brain j in various "Races 
and sao of Man ; by Samvet Geonrce MorronyM.D., 246 
XXVIL. Remarks on he. Aneroid Barometer ; Py Professor ee, 
J. Loverine of Harvard University, : 249 
XXVUUI. An account of some Fossil Bones found in Vern ia in 
ee excavations for the Rutland and rea Rail- 
; by Zapock THompson, _ 256 
XNIK. Rohe of a Meteorological Sauce one at Maxie, 3 
Ohio, for the year 1849, by S. P. Hinprern, M_D., = 264 
XXX. Chemical Examinations moe Waiters of some of ihe Min- ae 
‘eral Springs of Canada, by T. S. Hunt, - + 266 
SCIENTIFIC INT REESE SSE: 
