BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE. 51 



■any) due to each day throughout a lunar course, — and so on for 100 courses in due 

 order. The follo'wing table exhibits the result : — 



Position of the Moon with reference to the Plane of the Earth's Orbit in its connexion with 

 the fiain-fall of London and its vicinity, as deduced from a Register of the Vfeather 

 during 100 courses of that Luminary. 



ON A LAW OF TEMPEEAT0RE DEPENDING UPON LUNAR INFLUENOE,- 

 HAURISON. 



-BY ME. J. P. 



The author commenced by saying that, although the question of lunar influence 

 on the atmosphere of our planet was very generally considered as set at rest by 

 the investigations of M. Arago, yet he felt very confident that he was in a position 

 to prove the law he was now about to announce without fear of contradiction. 

 He had reduced and thrown into the form of tables and of curves 2S0 lunations, 

 with the corresponding mean temperatures : and the laws at which he had arrived 

 were -.—First, between the first and second octant the temperature immediately after 

 the first quarter, both on the average and also, with rare exceptions, in each indi- 

 vidual lunation is higher than the temperature shortly before the first quarter ; 

 Beeondly, and more particularly : the mean temperature of the annual means of the 

 second day after the first quarter (or the tenth day of the moon's age) is always 

 higher than that of the third day before the first quarter (or the fifth day of the 

 lunation.) 



ON THE EFFECT OF WIND ON THE INTENSITY OF SOUND. — BY IPROF, G. G. STOKES. 



The remarkable diminution in the intensity of sound, which is produced when 

 a strong wind blows in a direction from the observer towards the source of sound, 

 is familiar to everybody, but has not hitherto been explained, so far as the author 

 is aware. At first sight we might be disposed to attribute it merely to the in- 

 crease in the radius of the sound-wave which reaches the observer. The whole 



