﻿10 KNECHT, On some Constituents of Manchester Soot. 



there is nothing to neutralise the free sulphuric acid in 

 which our atmosphere has been shown to abound by 

 various observers, and it is to this circumstance mainly 

 that its destructive action on vegetation must be ascribed. 

 To suggest a remedy would here be out of place, for 

 it would open up the whole question of smoke abatement 

 in dwellings. It is common knowledge that the average 

 household grate is capable of considerable improvement, 

 as far as efficiency is concerned, but with the coal which 

 is available in this district, no material improvement in 

 the atmosphere can be looked for without some legislation 

 in this respect. 



