The postal card system has been Tit opeiation for several mom Its in Canti-da, atlt;d lias proved as popular there a4 in Greet Britain, where it originated. Upon the face of the caid are ruled' lines for the address and the stamp: The reverse is blank, with space stifR-oienl 10 write twelve or eighteen lines of correspondence. The cards ard used for many purposes, and are rap* idly taking the placeol printed circulars, for mail distribution, as llejr »r,W much cheaper, and save the trouble and expense of folding, and also the* cost of envelopes. They are freely used for the purposes ot correspondence where privacy is unnecessary, and letter writing in tho dominion had been greatly stimulated by their intro duction. An almost indelible pencil is used, and a«r it lias become a custom for nearly everybody to keep lb# pockets supplied with the cards, com1* iiuinicalions are jotted down and thrown into the idler boxes in tk« street ar.d at railway stations as coin1* nioiilv as letters are written in the of. rice or dwell inn under tlie old system. Mr. Hill, of New Jonrey, has introduced ill congress a bill providing for the issue of cards on a similar system here.