TRANSACTIONS OF THE SECTIONS. 29 
On the Variation in the Quantity of Rain due to the Moon’s Position in 
reference to the Plane of the Earth's Orbit. By C. Yursrook. 
The author called attention to an important difference in the amount of rain which 
falls in these latitudes at opposite parts of the moon’s course with reference to the 
plane of the earth’s orbit :—a result obtained by placing horizontally (from the daily 
register of Howard, in the vicinity of London) the amount of rain (when any) due 
to each day throughout a lunar course, and so on for 100 courses in due order. 
The following Table exhibits the result :— 
Position of the Moon with reference to the Plane of the Earth’s Orbit in its connexion 
with the Rain-fall of London and its vicinity, as deduced from a Register of the 
Weather during 100 courses of that Luminary. 
Position of the Moon. Days. Amount of Rain. 
In greatest South Latitude. 
rr inches in 500 days. 
Ascending through the plane of earth’s } J 
orbit. 
In North Latitude. 1 
Descending through the plane of 19 26-42 inches in. 500 days; 
earth’s orbit. 20 J 
In South Latitude. 25 
_ his effect the author supposes to be due to alternate southerly and northerly cur- 
rents depending on the ascent and descent of the moon through the plane of the 
earth’s orbit. Be this as it may, it is reasonable to infer, that when she is thus in 
some way producing an excess of rain in these latitudes, comparatively dry weather 
obtains in corresponding southern latitudes, and vice versd; and that intermediate 
latitudes experience an intermediate degree of the effect. Meteorologists of other 
latitudes and distant countries, who may possess a register of the weather extending 
over one hundred courses, or about seven years and a half, should try the result for 
their respective latitudes, and transmit their conclusions to the author. 
On Simultaneous Isothermal Lines. By Professor Hennessy, M.R.IA. 
Having briefly referred to the interest shown by the Association in the question 
of distribution of temperature over the surface of the earth by the publication of 
the maps of Prof. Dove, and acknowledged the importance of the results furnished 
by a comparison of mean temperatures in connexion with the climatology of the globe, 
_ Mr, Hennessy proceeded to describe the new species of isothermals now proposed. 
