Two years in Peru : with exploration of its antiquities . canic action, generating sulphuretted hydrogengas. The vicinity of Callao, too, is generally ofthat boulder or rubble formation in its upper geo-logical stratum, through which such gas could beeliminated without any difficulty. Although metwith at Callao in its most aggravated form, thePainter is likewise found along the coastas far as San Jose de Lambayeque, nearly fivehundred miles north. Prom the end of Decemberuntil April, is the time when this phenomenonmostly exists. I have before me an analysis of the sea water ofCallao, bottled
Two years in Peru : with exploration of its antiquities . canic action, generating sulphuretted hydrogengas. The vicinity of Callao, too, is generally ofthat boulder or rubble formation in its upper geo-logical stratum, through which such gas could beeliminated without any difficulty. Although metwith at Callao in its most aggravated form, thePainter is likewise found along the coastas far as San Jose de Lambayeque, nearly fivehundred miles north. Prom the end of Decemberuntil April, is the time when this phenomenonmostly exists. I have before me an analysis of the sea water ofCallao, bottled up during the existence of thePainter, and having some mud from the bottom ofthe bay contained therein. This was sent by to London, and was there analyzed byMr. T. Keates, , Consulting Chemist to theMetropolitan Board of Works, &c. Mr. Keatesreports that, after being allowed to rest, the waterpoured off proved to be sea water, and that theblack mud left, after the water had been decanted,was in a state of active decomposition—large. PLAN OF CrURENTS KUXMNG INTO CALLAO BAY. [ JIS. CIIAI. \l OALLAO TAINTMU. 221 qnaiiiitioa of siilpliurcjttod liydrofjfon gas, as wellas Hul|)]ia((^ of uiiimoTiia, being given off. ^Ilicblack coloin* of tlic iiiiid was found to b(^ owingto tlio presence of snlpliate of iivjii, wliicli wasformed as a result of tlu^ decomposition men-tioned. Whilst this latter was duo to the sulphurof the organic matter combining witli the ironpresent in the mineral part of the mud, to pro-duce the black sulphide. So far it appears to me, the idea of anorigin from vegetable malaria coming downfi^om the Andes, or of local causes, be theyanimal or vegetable, may be considered withoutfoundation. 1000 parts of the mud dried at 230° Falir. yielded,— Water 7G9-G Dry mud 230-4 1000-0 100 parts of the dried mud yielded by analysis,— Organic matter . « , . 10-50 Chloride of sodium, alkaline sulphates, &c. 6-43^ Salts of lime ..... 3-75 Alumina
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Keywords: ., bookcentury1800, bookdecade1870, bookidtwoyearsinpe, bookyear1873
