Injurious Manufactories . 
taining the utmost cleanliness in the manufactories, so 
that nothing shall be left to putrify in them, and all the 
refuse capable of fermentation be lost in deep wells, and 
prevented from any way incommoding the neighbours. 
We shall observe too, that when new manufactories of 
Prussian blue, sal ammoniac, leather, starch, or any 
other article by which vapours very inconvenient to the 
neighbours, or danger of fire or explosions are to be 
established, it would be wise, just, and prudent, to lay 
down as a principle, that they are not to be admitted into 
cities, or near dwellings, without special authority ; and 
that, if persons neglect to comply with this indispensable 
condition, their manufactories may be ordered to be re- 
moved without any indemnification. 
It follows from our report, 1st, that catgut manufacto- 
ries, laystalls, steeping of hemp, and every establish 
ment in which animal or vegetable matters are heaped 
together to putrify in large quantities, are injurious to 
health, and ought to be remote from towns and every 
dwelling house : Sdly, that manufactories where disa- 
greeable smells are occasioned through the action of fire, 
as in the making of acids, Prussian blue, and sal ammo- 
niac, are dangerous to the neighbours only from want of 
due precautions, and that the care of government should 
extend only to an active and enlightened superintend- 
ance, having for its objects the improvement of their pro- 
cesses and of the management of the fire, and the main- 
tenance of cleanliness : 3dly, that it would be worthy a 
good and wise government, to make regulations prohibit- 
ing the future establishment of any manufacture, the vi- 
cinity of which is attended with any essential inconve- 
nience or danger, in towns or near dwelling-houses, 
without special authority previously obtained. In this 
class may be comprised the manufactories of poudrette, 
leather, and starch : foundries, melting houses for tal- 
