OP ARTS AND SCIENCES. 225 



The general differences in the behavior of the two sets of alloys 

 may perhaps be accounted for by the distinction which Matthiesseu* 

 made between the two kinds of alloys. He classes an alloy of lead 

 and tin amonw those which are " solidified solutions of one metal in 

 another," while he calls alloys, like copper and zinc, " solidified solu- 

 tions of one metal in an allotropic modification of another." 



* British Association Report, 1863, p. 47. 



VOL. xviii. (n. 8. X.) 15 



