but suggest frequent impurities. For instance, in the process of making the dough, in particular, the work is so severe, the posture so disadvantageous, and the heat of the bakehouse so intense, that it frequently happens that the perspiration drops from the men's faces into the dough; and their arms, immersed in the dough, are necessarily at the same time covered with perspiration. Another fact is that, during the process of making the dough, which usually lasts from half an hour to

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... rs of an hour, the men inhale the flour-dust, and the carbonic acid gas, generated by the fermentation,