Sib, — I have read with clue attention the articles whiih 1 from' time to 'time 'have 'appeared ] in ' thej Journal to this subject,' retrospectivolyj'to'' ithe timo of ;th_e notorious Uerdan. , "Ifina onftlTsic}6s' numeions claimants— each advocating" the peculiar excellence of h;s owm<inveption>;i Imfcjlnote as. a; jgetieial xule^that^they never accompany ..their, state : { mentß ( mth > 4(.«U'j»wjot and attested' statitlup^itQ thp, canatyiljiieis" of "their engine*,' the duty, they) are jable^ to perform 'daily, the amount of horse power required^, |por ton of oio pitlvensed^ and the ''total cost, pi .grinding, also the degree! of fineue4s i$ which the ore. 'is pulverised— to' which I shall' refer subsequently. -V,' t ' Now,' as Gold Mining and the Eedu6ti6il< of Gold 1 ( Ores are ' occupying' the attention of'a great part 'of the mining world at present, T think it would' be use- ■ialf by^means of an .amicable coutroveisy, to -invite the advocates of each separate scheme to conio for- > 'ward and, contribute their opinions and experience i for the good of the mining community in general,, as well as, fpr their; owu., ( I ieel^ certain that,, with 1 ,yoiir usual' "court'sey, yoii will affoid' a t reasonable space,in'ihe' Journal for ihe'Gold'Mining'lnterest. ' ' Applying political' teriris to mining'matters, I may ' 's»,y that niyopinions »re 'decidedly ;" r Libei«l," being 'always - willing to admit and adopt any innovation upon i the old-established systems/, provided it is ascertained clearly to be an improvement. !But, ou J the'other hand,' l i&raf so , far, "Conservative." as to insist ,on '■ sticking %o, _, old,. well-established, and .thoroughly ipro yon processes, until, l shall have beeu 'convinced -by actual ,trial, or fidei dignce proofs or (evidence, that another systen^is more advantageous. 