ield, ; Tyndall us to the effect of vapor in the air on sound waves, Mass. and, at the same time, fails to coincide with Professor Rey- Mr. W. Bartlett, in a letter to the Railroad Gazette, says: nold’s statement of the upwardly increasing velocity of the The material diffused upon the leaves air… … feet. The spans being all similar renders it ing consideration, it should have an effect necessary to describe one span only. of only one per cent. The only explanation which las vefore the soil is poisoned so as to prevent the growth of all The span is composed of three trusses, onc central and…
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