187%. | 509 [Chase. 
the half-month of lunar opposition ; a pretty regular increase of rain 
from the first°octant, when the moon is on the meridian at the time of 
greatest solar heat, until nearly the fifth octant, when her dircct merid- 
ional influence is exerted at the time of morning low barome‘er ; average 
fain when that influence is felt at sunset, or at the morning barometric 
maximum 3; a principal maximum, near the morning barometric minimum, 
and a principal minimum near sunrise, when the nocturnal precipitation 
is over; other minima soon after sunset, after the maximum heat of the 
day, and after midnight. These features all seem so natural and so sim- 
ply explicable, that I am unable to regard them as other than typical. 
I regret that Mr. Hennessey’s observations at Mussoorie were commu- 
nicated only for the days of quarterly change. They appear to indicate 
a curve still more strikingly similar to that of the solar-hourly rainfall, 
and the indication is corroborated by their influence on the general aggre- 
gates, as shown in Aggregate C. 
It would be possible, even with the data now at my command, to form 
interesting approximations to the normal lunar curves for each calendar 
month, but I prefer to wait for observations from a much larger number 
ot stations, before undertaking any more minute calculations than I have 
embodied in the accompanying table. Even these normals may be em- 
ployed in connection with barometric and thermometric normals in the 
study of weather changes ; provided such allowances are made as are 
obviously required, for the blending of currents over or near the great 
Lakes, the Gulf, and the ocean. Such limited use of them as I-have 
already made, has strengthened my conviction that the day is not far 
distant when the normal lunar influence will be ranked among the im- 
portant elements for calculating the disturbances, and the tendencies 
towards equilibrium, which determine all meteorological fluctuations, 
and render satisfactory forecasts practicable. 
Stated Meeting, November 1, 1872. 
Present, 16 members. 
Vice-President, Mr. Frauey, in the Chair. 
The Rev. Mr. Nichols, a newly elected member, was pre- 
sented to the presiding officer and took his seat. 
A circular letter in-reference to a new table of logarithms 
was received from Mr. Ed. Sang, dated No, 2 George strect, 
Edinborough, Oct. l5th, 1872. 
A letter was received from Dr. William Elder, addressed 
to the Curators, dated No. 1824 Mount Vernon Street, Phil- 
adelphia, Oct. 81st, 1872. On motion the Curators were 
