506 M. E. Jochmann on the Electric Currents induced 

 € 4 H 3 BrK 2 4 + K 2 S=KBr + € 4 H 3 K 3 O 4 S. 



Monobromosuccinate Monosulphomalate 



of potassium. of potassium. 



Monosulphomalic acid, as prepared from the liquid resulting 

 from the above reaction by a process essentially the same as that 

 for the preparation of monosulpholactic acid, is an indistinctly 

 crystalline, deliquescent, strongly acid substance, which becomes 

 brown at 100°, and decomposes when heated more strongly. 

 Its barium-, lead-, and silver-salts are all amorphous precipi- 

 tates. When oxidized with nitric acid, it yields a sulphoacid, 

 the sulphosuccinic acid. 



Lippmann*has found that chlorocarbonic acid unites directly 

 with olefiant gas. Dry ethylene gas was passed into a flask 

 containing chlorocarbonic acid. Combination took place, and a 

 product condensed on the sides of the flask in oily drops, which 

 could not, however, be obtained in large quantities, owing to the 

 difficulties of the experiment. The product was treated with 

 water, in which it at once dissolved with formation of hydro- 

 chloric acid and a new organic acid. This acid was found on 

 investigation to be monochloropropionic acid, C 3 H 5 CIO 2 . Hence 

 olefiant gas and chlorocarbonic acid had simply combined to form 

 chloride of lactyle ; thus 



€ 2 H 4 + COC1 2 = C 3 H 4 0C1 2 ; 

 Olefiant Chlorocarbonic Chloride of 

 gas. acid. lactyle. 



and the chloride of lactyle by treatment with water was con. 

 verted into hydrochloric and chloropropionic acids. From chlo. 

 ropropionic acid lactic acid was obtained by heating the barium- 

 salt of the former acid with water, in which chloride of barium 

 and lactic acid were formed. 



LXXVI. On the Electric Currents induced by a Magnet in a Ro- 

 tating Conductor. By E. Jochmann f. 



[With a Plate.] 



THE earliest observed phenomenon in electric induction was, 

 as is well known, the " rotation-magnetism " of Arago. 

 Although the fundamental experiment, where a copper plate is 

 made to rotate under the influence of a magnet, has been modi- 

 fied in a variety of ways, especially since Faraday's discovery of 



* Liebig's Annalen, January 1864. 



t From the Journal fur die reine und angewandte Mathematik, vol. lxiii. 

 p. 158. 



