Production of Muriatic Acid by Galvanism. l67 

 Jppncallonof the Ink for printing orange Cotton and 

 other Stnffi. 

 We mav easily conceive that this ink may be employed 

 with advantage for printing cloths of a whUe, yellow, or rose 

 oround, or any other clear colour. 



° The cloths or stuffs intended to be printed m this manner, 

 require no other preparation than to be dipped m a solution 

 of parchment or isinglass; and after tl.ey are dried they must 

 be rubbed with a glass polisher. 



The ink must be thickened for this purpose with a greater 

 quantity of gum Senegal, and then applied upon the cloths 

 or staffs in the usual manner by means of wooden or metal 



'^TlKce or four days after this operation the stuffs must be 

 first washed with a great quantity of clear water, and aher- 

 wards with soap and water, which will make them appear of 

 a liner black- 



XXVIII. Letter of Messrs. Civni and Petrini to Pro- 

 fessor Pacchiani, of Pisa, on. the supposed Production of 

 Muriatic Add hy Galvanism'^. 



When professor Simon t, by insulating the action of the 

 positive pole of the electrical column under water, obtained 

 oxygen gas and an acid as the result of his analysis ; and 

 when he recognised in this acid all the characteristics of the 

 muriatic acid, he supposed that it might be produced by the 

 muscular fibre which he had substituted in the place of the 

 metal wire communicating with the negative pole of the 

 column; and he went no further than imagining that he 

 .bad only obtained a result new, interesting, and agreeing 

 extremciy well with the most luminous facts of pneumatic 



chemistry. 



It was reserved for you to trace this result a little further; 

 and your repetition of the experiment produced this new and 



• Abridged from /Innala de Chimic, tome Ivi. p. 2G9. 

 I Annates de Chimie, tome xli. p. IOC. 



L 4 important 



