139 



The corresponding epochs for the two stations in the southern he- 

 misphere in like manner agree with one another. The easterly maxi- 

 mum occurs between 6 p. m. and 7 p. m. at St. Helena and the Cape of 

 Good Hope, and the easterly minimum between 5 a. m. and 6 a. m. It 

 is deserving of remark that these epochs do not differ considerably from 

 those of the opposite movements in the northorn hemisphere, the easterly 

 extreme in the one corresponding nearly vidth the westerly extreme in the 

 other. A similar opposition in the phenomena of the regular diurnal 

 change in the two hemispheres was pointed out by the author on a former 

 occasion, and there seems good reason to suppose that the two facts are 

 physically related. 



It appears, then, that the principal epochs of the disturbance-cur- 

 rents depend, in their mean values, upon the sun's hour-angle, and are 

 independent of the longitude of the place at which they occur. 



The foregoing relations, in the phenomena of the disturbance- cur- 

 rents, or in those of their effects, appear to be of a very general nature, 

 and such as to afford a distinct basis for physical theory. The author 

 hoped to resume the subject upon a future occasion. 



MONDAY, MAY 12, 1862. 



The Yery Rev. Chaeles Geaves, D. D., President, in the Chair. 



Eesolved, on the recommendation of the Council, — That the sum of £50 

 be placed at the disposal of the Council for the purchase of antiquities, 

 and for the arrangement of the Museum. 



Captain Meadows Taylor, by permission of the Academy, read a 

 paper ^'On the Cromlechs and other Antiquarian Remains in the 

 Deccan." 



The Secretaet of the Academy read the following paper by Lieu- 

 tenant J. Haughtot?^, R. a. : — 



On the Diefeeence between Rain-Pall and Evapoeation at 

 St. Helena in 1860. 



The following observations were made, at the request of the Rev. 

 Professor Haughton, in the island of St. Helena, under the following 

 conditions : — 



The evaporation gauge consisted of a cylindrical glass vessel, 9 inches 

 high, and 4-85 inches wide. The level of the water was read off, and 

 brought to the zero (at the middle of the vessel) every Sunday morning, 

 at 10.45 A.M. The gauge was placed on the exposed roof of a house, 

 15 feet high, and was open on all sides to rain, wind, and sun. It was 

 at the leeward side of the island, the wind blowing almost always S.E. 

 The gauge was exactly 700 feet above the sea-level. 



In the year (of fifty- two weeks) commencing 12th February, 1860, 

 and ending 10th February, 1861, the total excess of evaporation over 

 rain-fall was 81*42 inches; and in no single week did the rain-fall 

 exceed the evaporation. 



