n-in8-0,fe13*i-;os.ag;oitrin* jeach «i surch that came* It on, calcd'fat^ to instil sectarian principles into the juvenile mind. If this ty* bo, the subject is a graff one, n« t to be trifled with. These objectoTO argue ..hat any pjhool whatever is potent or impote it for goocfy in proportion to the nmr* Its or i emerita ©if its library*The business jpf miuing was mow prosperous m iPUucviiile, in 1838, than in any other } sar since f 834. The north digging*yielde- tfn immense quantity of mineral during that year.j The CJiilis lead was being wo keJ, having been discovered in *37 f by Met} irsi JameajGillis and Willis—it gave 100,04 0. The Williama’lead was ditcov-ored in thi* latter part of* the winter, of *37 and 8, by'Messr^. Win. Williams, Robert Akan, and A. Aj. and T, Carrington—itgave £ 0,000. ly the spring of *38, Messrs* E. W. Robinson inti A. A. Carrington discoverer a iead onjMr. Henry Snowdon's entered 1, ad* whieJt gave 530,000* Althoughthe cub cm had prevailed with all the landi sholder;*' whether fhey held lands in fee simple, cr iy claims {« the form of minendlata on rest vej, to extract one-fourth, and in some h stances, o|io third of ail the mineral raised« n their resjioctive claims; Mr* Snowden do lined receiving any more than one fifth. fc contended that to take from theW-actual lt;pesjator wore than one filth, wm to be exlt; bitant; tljus giving evidence of his supcnc benevolence and magnanimity.Thelt; 3 v’cro a .'great many prospects and small 4 ins of mineral discovered this year; some o! them yielding from 40 to 60,000. In Apn1 *36, the ’O’Harm lead, which has yielded near a im/lcon and a half of mineral, was discovered by Win Nelson and Wm.Fortum , N clson sold his interest for anlt;ordinar - watch, and Fortune received a gun*fur his utercst* ’John Dickerson finally obtained one-fourtlf of it for a. trifle; and Capt. lt;‘’ifarra purchased one half of it for .$8,00 the other] fourth went to Vineyardas rent. Every niiner that was acquainted with tl 2 prospect when Capt. O’Harrapur*-; chased it, thought1 he had paid too much for it; tei t had been discovered at the west end an w\rkcd For the dh-tanee of 10 rod* w3thou giving Half as much mineral aswould pay for t|ss labor expended. The Oaptai i, huwei ry, prosecuted hi« labors;but it f udly gavcjcmt entirely, and he drif-, i ted sev ral feet fallout finding a particle of miiiv ral. Biftfopoti crossing a bar rock,ihe imn. *di,*tely ‘‘.struck it big.** Thus it is that i little pupcverancc fomelimes secures t- the nunc; a fortune. Indeed, upon worki» - this lewdj It was discovered that la early tJ nab there Aad been a shaft sunk w ithin 8 im lies of the largest mineral.It «i iglit be proper for me, here, (being myself a practical miner) to o8er a few ob-| t-crvati ne upon the subject of mining, and t J upon t \ various opinions now prevailing 1; among t the Platteville miners, as to a probable tlt; 3ory by which it may bo ascertained where « dig for mineral, and upon the re-poult or ■, or formation of lead ore.1st As to the mode by which mining is done. In early times, it was the custom todig dif lies in ravines, mostly, at the base of ridges, whose direction lies north and south. By th means float mineral (lumps of mineral 3 lug promiscuously sn the clay, ami which wo believed by many miners to have emans; ed from lieguiar vuina,) was discovered. Ufou thej discovery of float, the miner pi. scented h|j? labors by sinking ditcheshigher up the r.i'jinc, or in the lull side, for the pi; |K?se of discovering a ercvice in tho rock ; or it is iij crevices or figures running nearly Just and jwest, or north and south, that b* dies of mineral are found embedded. It isp.obably ov/ing to this mode of prospect! m , that, throughout the mining country, th • heaviest leads were discovered by the pj' neers* n is near the larger leads that t--2 greatest amount of float is found. But vii en ravines and hollows are all dug in, as 3 the case in the Plattevilio diggings, the in. icr goes op to more elevated ground, when* It is from-’lO to 14 feet through the i top ff! y to the rock, Hence, instead of digging i tchea, lie?, finds it i lore com enieni to sink i and or circular shafts, about 3 font in dia, aeter. Tjvvo expert miners Will ffaV a sha? of this ifize from 25 to 30 Ah in :, about hours; jjrovided they do bo^JM’V to i jeneou* ter hard rock. Mineral * found atvariom depths jiepending, to scfKHtlsot,upon t ie altitudift of ridges, across )w*h It runs. Yet it is not a temtwkaM^fcaf* rencelt; find two veins of mineral rRsbw across tlie samoiridge parallel with mcb ift-er. am the distance from the aurfuce of the grown will be to one of them, 40 foot, batto the other, perhaps not to exceed 10 feet.Son o miners^ prove ground much kttlT than c hers, wh|e some make it aa iatnfaU Me ra •* Co continue linking until they arrive a water, to exceedingly hard f0ok_ other* become discouraged and. Oquittfc****' wh*n th*«f n