Iiukcwcll estÃmales the nverage amount of sak in ihe occiin at two and a half per cent. Frorn computa tiojfls based tipop the amuunt ot the tules it is highly probuble that the AllnÃ±tic and Tuci ie Oceans are, in their central porti, not les than nine or ten miles in depth. Were we t place the average depih of the ocean it fiv miles, it would doubiless be a moderate estÃmate Ãn superficial exlent ii covers fuÃ¼ three iifths o the eanh's surlace. Assuming, tlien. five milc as the average riepih of the OÃªe;m. and two anc a half per cent. as the average ntnount of sal contained in it, Were the waters entirely evaporBftÃ©d, the saline residue woul I form ast-ntum o Balt more than five hundred feet in thickness covering three-fifths oi the surface of il.e globe It' then this mass of aalt were eveiily spread ove the nmount of land on the enrih's surface, i would cover t to the dept of 270 feet. But not more tuan one-fifth of the eanh's surface is habitable. Were, then. the sak contained in the oeean spread over all the hahitnble pnrts Ã¶f the globe, it would cover ihem to the depth of'fÃ¶QO feet, orsomeihing more than a quarier of a mile. Let ustrv nnoiher mode of illustration. The superficies o! our planet is calcuiatsd to contain about 1(50 mÃ¼Ã¼ons of square miles. The territoryofthe United States may be estiaiated in round numbers at two millions of square miles, orone-nmetecnth of t!ie habitable surface of the globe: say, in rouiid number?, one-twentieih. - Were the sak of the Ocean, therelore; evenly spread over the entirc surlace of the United States trom the Atlanuc to the Parirle-, and from the Gulf of Mexico to IJritish America, it would cover it to the depth of 3).0(K) feet: erbetween 5 and 6 milef. I3ut were on!y-tliatj a t which is now bid out into Stnres and reducÃ¨d tocultivation, thus covered, the depfh wou!d be nearly twelve mÃ¼es. Once inore. The State of Ohio contains about 4Ã,(R)0 square miles, or one-filtieth Ã³f the emire territory of the United Siate. Let us. then, suppose all this snit collected into a pyramid coveiini; the entire State of Ohio, or iis equivalent, that is, an e.xtcnt of terl'itory 2Ã¼t) miles squnre; the pyrnmid of sak would shoot is crystal hcod 855 miles intÃ¶ the blue expnnse. leaviiig the clouds about its very bnse glitterini; in eterna! sunshine. ntid visible al the distance o!