308 LEAD IN VARIOUS ARTlEICIAL PRODUCTS. 
the authorities charged with the public health, to superin- 
tend,withthe greatest attention, manufactures of this kind." 
Had I had any knowledge of the note of M. Braconnot 
at the time when I compiled the above quoted report, I 
should certainly not have failed to mention it as a most 
strongly corroborative proof of the statements in the passage 
quoted above. 
Conclusions. 
1st. It is evident that woollen tissues should not be put 
into contact with materials' containing lead or copper,when 
they are destined to be exposed to steam or hot water, to 
preserve a white ground, or to receive light colors. 
2nd. Woollen tissues, or size, which served for the sizing 
of their warp, and cloth tissues dressed with a preparation 
of lead, which gave rise to the phenomena signalised in 
the above note, on being subjected to the test of liquid sul- 
phuretted hydrogen, which I proposed some years since, 
produce a striking coloration, and this agent, consequently, 
is qualified to obviate all the inconveniences which might 
result from the presence of oxide of lead. 
3rd. In future, in all chemical or medico-legal researches 
in which the subject of investigation is lead or its com- 
pounds, it will, above all, be indispensable to subject the 
alkaline reagents to the proper experiments, to ascertain 
whether these latter bodies are free from oxide of lead, and 
whether they have received none from the glass vessels in 
which their solutions may have been put. — The Chemist. 
