226 P. E. Chase on Aerial Tides. 
The minute quantity of peroxyd of iron came from exceed- 
ingly fine particles of iron diffused through the minerals, and 
could be seen by a magnifying glass. One separate analysis was 
made for the soda. 
The constitution of the mineral, as made out from the num- 
bers in analysis 1, is— 
Oxygen. Oxygen ratio. 
Silica, : . ‘ 2 - 31-22 2 
Mepeeing 3 at t ; 
Soda, - . 19 
peeping to the formula Mg*Si?, equivalent to the general 
formula of pyroxene, R?5i?, ; 
he excess of silica obtained by Prof. Shepard in his analysis 
is doubtless due to an imperfect fusion of the mineral with the 
carbonate of soda, an error easily made, if the precautions I have 
already mentioned are not attended to. 
“Chladnite” approaches those forms of pyroxene known as 
white augite, diopside, white coccolite, &c.; these last named 
minerals having a part of the magnesia replaced by lime. It 
is identical in composition with Ensiatite of Kenngott, a pyrox- 
$00) mineral from Aloysthal in Moravia (this Journal, [2], xxi, 
From these observations it will be seen that the Bishopville 
meteoric stone, however different in external characteristics from 
other similar bodies, is, after all, identical with the great family 
of pyroxenic meteoric stones. . 
Art, XXV.—Aerial Tides; by Priny Earnie Onase, M.A, 
ie A 
THE remarkable coincidence, which I have pointed out, be- 
tween the theoretical effects of rotation and the results of baro- 
metrical observations, has led me to extend my researches with 4 
view of defining more precisely some of the most im yrtan 
te atmosphere. The popular belief 10 
“ From the Proceedings of the American Philosophical Society. 
