The Bureau of Industrial Hygiene has been called upon by some of the more intelligent service station managers-particularly those having a large number of service stations to provide for-for a disinterested opinion as to the efficacy of these measures. One of the chemical substances on the market is essentially a combination of chlorine and formaldehyde, which is to be sprayed into the workroom.
The whole reaction is in the nature of a reversible mass action, dependent for its direction upon the relative tensions of the two gases. About one-half the equilibrium is reached in the first hour, and about three- quarters in the first two hours. On breathing fresh air, carbon monoxide is eliminated from the body at the rate of 30-60 per cent. reduction of blood concentration per hour.
Undoubtedly there will be cases where even with the entire blood picture at hand the diagnosis will will remain in doubt. But on the whole it is to be expected that the whole blood picture will give considerably more valuable information than would be the mere fact of the presence or absence of stippled cells. Industrial Hygiene Bulletin.