250 Messrs. F. C. Calvert and R. Johnson on Alloys. 



ceeded, perfectly corroborate these views, and we hope that when 

 we have completed this new field of investigation, we shall have 

 practical results to offer. 



Action of Hydrochloric Acid, full strength 1-34, for two hours. 



Therefore these alloys are much less attacked than the metals 

 which compose them ; and it is certainly interesting to find that 

 the alloy No. 3, which contains nearly 50 per cent, of zinc, is 

 attacked so slightly by the hydrochloric acid. This inertness 

 of an acid, having a most powerful action on one or more of the 

 metals composing an alloy, is most curious ; and what increases 

 its interest is, that it appears to be general, as seen in the fol- 

 lowing tables, which illustrate the action of sulphuric acid : — 



Composition of Action of sulphuric Action of sulphuric acid 

 alloy. acid, spec. grav. on the metals. 



