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of you probably do to the proper drainage and cleansing of a city, and to the proper disposal of its outflow, than to any system of quarantine. My knowledge of the history of the yellow fever epidemics in this valley is infi!litely less than yours; but I feel warranted, and I take my warrant from the history of the pJagues which devastated the filthy me dire val cities of Europe, and from my own knowledge of the want of cleanl inel'l s and want of drainage in the city of Memphis. in venturing the su g: gestio � that even that f�ver smitten town may be made an ImpOSSIble field for the Inva sion of yellow fever in an epidemic form. tropical trees and arboraceous plants. In the natural state to the same objections. It is an approximation 'to the meth' (ordinary India-rubber) it is a mixture of at least two hydro-ods of F. Schulze and F. Bellamy. * carbons containing the same relative proportions of carbon and hydrogen. It is also noteworthy that these proportions IV.-DETERMINATION OF ORGANIC MATTER BY MEANS OF are the same as obtain in rectified oil of turpentine (C,oHul. PERMANGANATE. Caoutchouc is not viscous, and therefore can be employed The authors describe the modifications proposed by Kubel. in• high atmospheric temperatures. It also forms a hard, Schulze, and Tidy. The fin-t uf these, which they comider continuous surface when in spirituous solution and applied preferable, consists in acidulating with dilute sulphUrIC acio to iron surfaces as a varnish. But it has imperfections of, and boiling for ten minutes with an excess of centinormal such a character that, when employed alone as a basis for permanganate. The residue of the latter is decomposed by a preservative varnish, the result is a coating inferior to that a centinormal solution of oxalic acid. and the excess of the formed by coal tar in its general use. Thb coating is prone latter titrated with permanganate. From the total quantity to be affected by natural influences in a curious way. For of the latter the proportion which has served for the oxida. instance, i n the dark, atmospheric oxygen and water exert lion of the oxalic acid is deducted, the remainder showing co � paratively little influence on it, bu ! in � aylight it is v�ry the permanganate decomposed by the organic matter of the serIOusly altered by these age?ts. OX IdatIOn and hydratIOn wliter. Brown.

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