. Transactions. e LateriticAlterations of Serpentine, Producing the Iron Ores of the Mayari Dis-trict OP Eastern Cuba. resulting in a downward secondary concentration of iron oxide. Nickeland cobalt are lost relative to iron and alumina, the loss being sharplyaccelerated at about the same depth at which a sharp acceleration in therelative increase of alumina occurs. The percentage of combined wateris comparatively constant but in actual amount combined water is lostrelative to iron and alumina. The marked loss of nickel and cobalt during the formation of the oresuggests the possibility of seco
. Transactions. e LateriticAlterations of Serpentine, Producing the Iron Ores of the Mayari Dis-trict OP Eastern Cuba. resulting in a downward secondary concentration of iron oxide. Nickeland cobalt are lost relative to iron and alumina, the loss being sharplyaccelerated at about the same depth at which a sharp acceleration in therelative increase of alumina occurs. The percentage of combined wateris comparatively constant but in actual amount combined water is lostrelative to iron and alumina. The marked loss of nickel and cobalt during the formation of the oresuggests the possibility of secondary downward concentration of thesemetals. Descriptions of the nickel ores of New Caledonia indicate that DATA ON ORIGIN OF LATERITIC IRON ORES OF EASTERN CUBA they are the result of alteration of peridotic and pyroxenic rocks and ofserpentine rocks derived from them, from which the nickel is leachedduring weathering and carried down and deposited as hydrated silicates hich qrodes into reddish-brownshot oreJ A. roror\jtvj[\)torv)r\)r\3iv) ^ ;^ CD 0) ^ 0) DEPTH IN FEET in veins in the underlying unaltered or slightly altered rock. This sug-gests the possibility of similar occurrence of secondary nickel-bearingminerals in the serpentine rock beneath the Cuban iron-ore deposits. CONSERVATION OF IRON ORK 79 Conservation of Iron Ore BY C. K. LEITH, MADISON, WIS.(New York Meeting, February, 1916) Quoting from Dr. Richard T. Ely:^ Conservation, narrowly and strictly considered, meansthe preservation inunimpaired efficiency of the resources of the earth; or in a condition so nearly unim-paired as the nature of the case, or wise exhaustion, admits. And broadly considered,it means more than the word itself implies, for it naturally includes an examinationof methods whereby the natural inheritance of the human race may be improved;and still more broadly considered, and as used in popular discussion, it includes atreatment of the effects of productive conservation methods upon distributi
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