608 Intelligence and Miscellaneous Articles. 



acid produces insolations of anilin a precipitate which is sometimes 

 of a deep green colour, and at others of a blackish blue : this acid 

 appears to be a good reagent for anilin, since it is readily produced 

 even in weak solutions ; when the precipitate is obtained from con- 

 centrated solutions it leaves a considerable quantity of oxide of 

 chromium when calcined. Oxymanganate of potash and the salts of 

 anilin suffer mutual decomposition, brown oxide of manganese being 

 deposited. Anilin yielded by analysis. 



Hydrogen 7*54 



Carbon 78-21 



Azote 14-83 



Hydrochlorate of anilin is obtained by direct combination and 

 crystallization ; it is very soluble in water. It consists of 



Hydrochloric acid 27-81 



Anilin 72-19 100-00. 



Oxalate of anilin is obtained by mixing a spirituous solution of 

 anilin with oxalic acid. This salt is a white powder, which is to 

 be washed with alcohol and then dissolved in hot water ; on cooling 

 fine crystals of the salt are obtained of several lines in length. This 

 salt appeared to consist of 



Oxalic acid 2£-92 



Anilin G7-64 



Water 6-44 100-00. 



L'Institut, No. 356. 



Notice hy Prof. Dove respecting the Error in his Letter 07i the 

 Law of Storms, pointed out by Sir David Brewster a^ p. 5 1 4. 



By some inadvertence I have confounded the notice of Reid's 

 work in the Edinburgh Review, 1839, p. 406, with that in the 

 Foreign Quarterly Review, 1839, p. 1. The paragraph men- 

 tioned by me occurs in the latter work, at p. 2. Those who have 

 read my memoir "On Barometric Minima," which appeared in 

 PoggendorfPs Annalen^ vol. xiii. p. 596, will be best able to 

 judge of the share which I have had in the explanation of the 

 phaenomena of storms. As this memoir appears to be known 

 only in Germany, I may observe that the still important em- 

 pirical data contained in it, have been combined in my recent 

 article on the law of storms (FoggendorlF's Aiiiialeii, 1840, Jan., 

 p. 1), with those for which we are indebted to Messrs. Reid and 

 Redfield. Which of the theoretical derivations, whether that 

 given by Mr. Redfield, at p. 33 on the storms of the American 

 coast, or that published by me (analogous to the circular pola- 

 rization of light), agrees best with the totality of the pheeno- 

 mena, — or whether the connexion suspected by Messrs. Reid 

 and Piddington, with the magnetism of the earth, be more pro- 

 bable, — I leave to the opinion of those who may be inclined to 

 test these views collectively. -^tt Yicw 



JwieUth. w.a^ovi.. 



INDEX 



