of Milphuric arid (nil of vitro! II 2 S( ) ,), and of can-tic soda (Xall< >), 

 Are., in water.-" 



Solution exhibits a reverse reaction : that is to >av. if the water be 

 expelled from a solution, the sulistanee originally taken is re-ol)t;iiiied. 

 Unt it must le borne in mind that the expulsion of the water taken for 

 -olution is not accomplished with equal facility throughout, because 

 watei 1 lias different decrees of chemical atHnit v for the substance di>- 

 -.olved. Thus, if a solution of sulphuric acid, which mixes with water 

 in all proportions, lie heated, it will be found that very different 

 decrees of heat are required to expel the water. When it is in a lari^e 



i-,,,.; :, ,n. ,,-,,!-,, t',i.- -r. '.d.-t ri-c ..f temperature, corre^pi'iiiN witli the f.u-niMt i<m <[ :\ 

 ?nh\dr,tte II SO ,.-jH < ) ~:',-\ p.c. H S( ) , . wliii-li \ erv lil<ely repeals it -elf in a similar 

 f, ,,.,,, I,, other -.nhiticii-. alllHiu.L'h all t he phenomena i of cunt raeti.ni, vnlut imi of heat, ami 

 ,-;. ,,i temperature- are \rry c..mplex ami are depemlenl 1.11 many <-i rcii mst a nces. One 

 .....Mil, I tliinl;. h.-u. ..-!. ju. i-iii-.' from the alm\e example-, that all other influcnc<-s are 

 (,. ( .l,ler in their .1, -tii. ii than ehemiral attraction, especially when it is so er,nsi(leral>le as 

 I,, t'Ai--ii -ulphunr aci.l ainl v.ater. 



