Abstract: The base united with the olivine or eilstatite gives the structures which have becn taBcn by Drs. EIahn and \\Vcinlaucl as of oiganic origin. I shonlcl cspect to find tlic choucliitic strtlctnrc in terrestrial periciotites, if any call bc fo1mcl in which tlic crj stallization hnd been arrcstcd and subsequent alteiation lias not takcn placc. The difference in structure bct~vcen the rapidly solidiliccl, or cliondlitic, and the crystalline l?criclotites is not ally greater tllan tliat betn eel1 the tach) litic, basaltic, doleritic, or diabasic statc of thc basalts. All serl~entincs not einstones, which h a ~ e been caref~illgstlidied, appear to belong to periclotite, as a variety proclucccl by alteration. 4. Basalt. -To the basalts I shonlcl assign such inetcorites 35 those of J o n ~ n c , btanuern, Constantiuoplc, Petcrsbmg, Juvcuas, Shergotty, Charkow, ITra~~lifort, Shallin, Biassing, Busti, Manegnuin, Ibbenbdreu, etc., so far as their cliaracters arc at ~rese i i t lrnown. These llavc a lower sl3ccific g r a ~ ity than tlic prccecling, a higher l~ercentnge of silica, less iron an(1 inagnesia, but more lilne, tzlld ~~sunl lv more aluminin. S o n ~ eof tllese mctcoritcs, likc tlie Sllcrgotty aiid AIanegaum ones, :we apparently allied to the gahbro v a r i e t ~ of basalt.

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