Transactions . a in C,,drops suddenly in C,, thence slowly to C4 then it takes an upwardturn to C, which shows a slight decrease. The copjx^r content of the middles product shows a steadyderreas from 1 • U lbs. in C, io 0-7) llxs in C^; in C, it jump-< upto 1-9 lbs. The tailings give a decreiusing amount of {opjHr frum 1 -39 C, to 0 87 lbs. in C^; Cj tailings nrv richer while in C, the copperin the tailings is more than doubled. OoO SCREEXING AND CLASSIFYING—CoX-GlBBINS-PORTER The heads of the C tests are in no case as rich as the richer ofthe S tests, but, on the other han

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Transactions . a in C,,drops suddenly in C,, thence slowly to C4 then it takes an upwardturn to C, which shows a slight decrease. The copjx^r content of the middles product shows a steadyderreas from 1 • U lbs. in C, io 0-7) llxs in C^; in C, it jump-< upto 1-9 lbs. The tailings give a decreiusing amount of {opjHr frum 1 -39 C, to 0 87 lbs. in C^; Cj tailings nrv richer while in C, the copperin the tailings is more than doubled. OoO SCREEXING AND CLASSIFYING—CoX-GlBBINS-PORTER The heads of the C tests are in no case as rich as the richer ofthe S tests, but, on the other hand, no C test falls as low as S^. The heads obtained in the natural feed, sun N^, are the richestof the tests. The accompanying curves illustrate these facts the heads diagram we see the remarkable similarity of the ( IHinniliniHHinpilliiliilpHinHlilHHIinHninilliiiiiiini^ |iuijjIiiii:iiiyiji:liH|ii:lii::h:H::!:»!H:i:[^ L2?!;—:~«*?i;:a;.«s:.::::!:.!!.-.;:;;^!.-:-:::?::::::a.

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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895