326 



Intelligence and Miscellaneous Articles* 



11. " On the Death of Fishes in the Sea during the Monsoon." 

 By Sir William Denison, Governor of Madras, &c. In a letter to 

 Sir Roderick Murchison, F.R.S., F.G.S. 



Steaming between Mangalore and Cananore on the west coast of 

 India, the author found that for some time after the south-west mon- 

 soon the sea was offensive with dead fish, killed by the great mass of 

 fresh water poured into the sea during the season of the monsoon. 



XLIII. Intelligence and Miscellaneous Articles, 



AMPERIAN REPULSION. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 

 TT would appear, from a letter of Professors van Breda and Loge- 

 man's, published in your Magazine for August last, that they are 

 still under the impression that the apparatus described and illustrated 

 by them in their former letter, was constructed upon sound princi- 

 ples, and that they attribute my objections to some misunderstanding 

 on my part in regard to its construction. 



The accompanying figure is an exact copy of the position of their 

 conductor in relation to the 

 currents in the mercury. If 

 the figure is correct, certainly 

 a mere glance will suffice to 

 convince any one acquainted 

 with the law of angular cur- 

 rents, that the horizontal part 

 D D of the conductor is im- 

 pelled in a contrary direction 

 to the perpendicular parts, as 

 is represented by the larger 

 arrows, and consequently motion under these circumstances is abso" 

 lutely impossible. 



I am, Gentlemen, 



Your most obedient Servant, 



Glasgow, September 3, 18G2. James Croll. 



ON THE CHANGES IN THE APPARENT SIZE OE THE MOON. 



To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 



I observe in the Philosophical Magazine for May, a letter addressed 

 to Professor Tyndall by Mr. Richard T. Lewis, containing an expla- 

 nation of the changes in the apparent size of the moon derived from 

 a binocular examination of a lunar stereograph. If Mr. Lewis will 

 turn to the Philosophical Magazine for January 1852*, he will find 

 the same explanation given by Sir David Brewster in his article "On 

 New Stereoscopes." 



In fig. 4 of Plate II. in that article a particular form of a stereo- 

 graph is given, which, when placed in the stereoscope, affords an 



* No. 15, vol. iii. pp. 19,20. 



