158 P. E. Chase on Barometric Indications of a Resisting Aether, 
conditions of the problem is better understood. I have thought 
it proper to present them in their present crudity, in order to 
show the true points of departure, and to prepare the way for 
some further considerations 
Whatever other heat- disturbing causes there may be, there 
can be little doubt that the three we have just been considering 
are the most important. Dividing tine " juehen aa day into 
four quadrants, and representing the solar effect by S., rotation 
by R., and barometric by B., it will be readily seen ‘that the 
pai positive and negative ‘influences must be distributed as 
ollows 
s. R. B 
From 0) to 64, — ni eae 
“6h to 12h, a ai + 
“ 125 to ist, nk te ~ 
* 18h to Oh, + ao 
The tables of average temperature at any given place would 
therefore furnish us with four equations for determining the 
value of each of the disturbing elements, providing those that 
are unknown were so insignificant as to be safely negl 
certain limits that can be pretty copula s determine 
ur discussion of the barometric fluctuations beeen a 
pndatey of inertia to retard the effects of eats so that the 
mean daily altitudes are found nearer to 1%, 7}, 13%, and 194, 
than to 04, 64, 12, and 18". A like tendency is discernible in 
the thermometer 
There are three, and only three, quadrantal divisions of the 
- ay, sear greets: ‘respectively at Ob, at 1, and at 2h, for which 
could obtain approximate positive values of S., 'R., and B, 
The maximum solar effect is deduced from the first, and the 
minimum from the third of these divisions; while the maximum 
rotative and barometric effects are exhibited in the third, and 
the r minimum in the first division. 
e nearest average temperatures are found in the third divi- 
sion,” as is shown below 
oo of temperature at 26 8h 14>, and 204, and of the en 
ay 
Station. op ronal Daily mean. 
fo} °o 
At Girard ne oe eee ows 52°1 52°71 , 
At St. Helena, 61°65 ‘61 69 
‘The flowing table presents all the codrdinate the Girard College values 
R., and B., that can be obtained f from the 
