452 Mr. T. B. Jordan's Remarks on 'Electro-Metallurgy. 



chloride of sulphur, benzoate of hydrobenzoyl is produced. 

 (Annates de Chemie et de Phys., 3rd ser., t. i. p. 291.) 



[It may be remarked, that the mention of a great number 

 of other bodies, whose composition and properties have not 

 been examined, has been excluded from this extract.] 



Formation of Murexid. 



Liebig and Wohler have found that when a concentrated 

 solution of pure alloxan is boiled, an evolution of carbonic 

 acid takes place, which continues for a long time. The so- 

 lution then gives, with baryta, a blue precipitate, and with 

 carbonate of ammonia a considerable quantity of murexid. 

 On cooling, and during the boiling, a quantity of alloxantin 

 is deposited, which explains the formation of murexid. If the 

 mother liquor is saturated with ammonia, oxalurate of am- 

 monia is obtained. Three atoms of alloxan give 



2 atoms Alloxantin = C 16 H 20 N 8 O 20 . 



1 atom Parabanic acid = C 6 H 4 N 4 O 6 . 



2 atoms Carbonic acid = C 2 O 4 . 



I 



3 atoms Alloxan =. C 24 H 24 N 12 3( \ 



(Annalen der Chemie und Pharmacie, xxxviii. p. 357.) 



LXVIII. A Jew Remarks on Electro-Metallurgy. By Mr. 

 T. B. Jordan*. 



N the course of a limited series of experiments, which I 

 have tried in this interesting branch of the useful applica- 

 tion of electricity, a few ideas have occurred to me, which, I 

 believe, possess the charm of novelty. As no suggestion, 

 however trivial in itself, can be considered altogether unim- 

 portant when it bears on the practical application of science 

 to our manufacturing arts, I feel no hesitation in laying be- 

 fore the Society the following remarks with a view to their 

 being made public. It is quite evident that Mr. Spencer's 

 recent discovery, of the art of depositing metals from a solu- 

 tion of their salts by galvanic action, has placed in the hands 

 of manufacturers a new means of copying, and the importance 

 of this will be immediately apparent to those who know how 

 large a portion of our manufactures in metal are the copies 

 of original matrixes, or more indirectly the results of other 

 copying processes. Some imagine that because it is only 

 the means of copying, it is really of little value ; but it is im- 

 possible to allow this to be a valid objection, when we consider 

 how very few metal articles there are, which do not wholly or 



* From the Eighth Annual Report of the Royal Cornwall Polytechnic 

 Society, 1840. 



