[1] The idea of this article, and the above facts, are derived from a
valuable memoir just published by the Board of Health, with reference
to the practical application of sewage water and town manures to
agricultural production.
[2] We understand that this has been the case with factory-owners at
Manchester who have applied the smoke-preventing apparatus. The saving
from such an apparatus in the office where this sheet is printed,
appears to be about 5 per cent.; an ample equivalent for the outlay.