TABLES 



SHOWING THE EFFECT OF DIFFERENT KINDS OF DUST UPON 

 THE HEALTH OF THE WORKERS.* 



TABLE I. 

 METALLIC DUST. 



STEEL DUST 



COPPER DUST 



LEAD DUST - 



BRASS DUST 



* Dr Ludwig Hirt, die Krankheiten der Arbiter, Beitrage. 

 1873-78 modified and adapted. 



Leipzig, 



