INJURIOUS MANUFACTORIES. 



in confluence of putrefaction or fermentation, which may be 

 deemed nuifances from their fmell, or dangerous fiom their 

 efFecls. 



The fecond clafs will include all thofe, in which the art'rft, 

 operating by the aid of fire, deveiopes and evolves in air or 

 vapour various principles, which are more or id's difa^reeable 

 to refpire, and reputed more or lefs injurious to healih. 

 ift clafs. In the firft clafs we may advert to the keeping of flax and 



Kemp, the making of catgut, flaughter-houfes, ftarch-manu- 

 factones, tanneries, breweries, &c. 

 ad clafs. In the fecond, the diftillalion of acids, of fpirits, and of 



animal fubfiance<; gilding on metals, preparations of lead, 

 copper, and mercury, Szc. 

 xft clafs injuri- The arts ot tne &*& chtfe, confidered in relation to the health 

 fus to health, of the pubhc, merit particular attention, becaufe the emana- 

 tions that proceed from fermentation or putrefaction are really 

 injurious to health in fome cafes, and under certain circum- 

 Stccping hemp, fiances : the fteeping of flax and hemp for in fiance, which is 

 performed in ponds or dill waters, infects the air and kills 

 fifties; and the difeafes to which it gives rife are all known 

 and defcribed: Accordingly wife regulations have almofl 

 every where enjoined, that this operation (hould be ear- 

 ned on without ihe precincts of towns, at a certain diftance 

 ffom every dwelling, and in waters, the fifli of which consti- 

 tute no refource for the public. Thefe regulations unquestion- 

 ably ought to be continued ; but as the execution of thern is 

 attended with fome inconvenience, it is to be wimed, that 

 Brale's method the procefs of Mr. Brale, the fuperiority of which has been 

 recommended. con f irme d by Meflrs. Mongez, Berthollet, Teffier,and Molard, 



fliould foon become known and adopted. 

 Beer vegetable Other operations on vegetables, or certain products of ve- 

 colours, ftarch, getation, to obtain fermented liquors, as in breweries; to extract 

 paper, &c. co lours, as in the manufactures of litmus, archil, and indigo; 



or to di vefi: them of fome of their principles, as in manufac- 

 tories of ftarcb, paper, &c. do not appear to us of fuch a na- 

 ture as to be capable of exciting any difquietude in the mind 

 of themagiftrate. At all events the emanations anting from 

 thefe fubftances in a fiate of fermentation can prove dangerous 

 only near the veflels and apparatus in which they are con- 

 fined, ceafuig to be fo the moment they are mingled with the 

 open air; fo that a little prudence only is required, to avoid all 



danger 



