11.50: 11.99| 1 | .. | .. | .. | 1 || .. | .. | 1 | .. | 1 12.00: 12.99| 1 | .. | .. | .. | 1 || 1 | .. | 1 | .. | 2 13.00: 13.99| .. | .. | .. | .. | .. || .. | .. | .. | .. | .. 14.00: 14.99| 1 | .. | .. | .. | 1 || .. | .. | .. | .. | .. 15.00: over | 1 | .. | 1 | .. | 2 || .. | 1 | .. | .. | 1 --------------+-----+-----+-----+-----+-----++-----+-----+-----+-----+---- Total | 24 | 8 | 10 | 4 | 46 || 54 | 21 | 15 | 11 | 101 --------------+-----+-----+-----+-----+-----++-----+-----+-----+-----+---- But bad food and bad housing are not the only enemies of the workman's health. The nature of his daily toil and the conditions under which it is performed are often against him. Even ventilation becomes important when one has to spend ten, eleven, or twelve hours a day in one room, and yet this is almost entirely neglected. In 1908 a special officer was appointed in New York State to make tests of the atmospheric conditions in places of business. One hundred and thirty-six factories were examined, and in some printing establishments as many as forty parts of carbonic-acid gas (CO_{2}) in ten thousand volumes of air were found, though a legal limit of twelve is recommended. One cigar factory, with windows partly open, had eighty such parts. The following table will exhibit the results of this investigation.[66] ------------------+----+-----+-----+-----+-----+-----+-----+----- Parts of CO_{2} in| | | | | | | | 10,000 vols. air |5-12|13-20|21-25|26-30|31-40|42-60|65-70|75-80 ------------------+----+-----+-----+-----+-----+-----+-----+----- Factories in | | | | | | | | each class | 82 | 166 | 80 | 67 | 30 | 8 | 3 | 3 ------------------+----+-----+-----+-----+-----+-----+-----+----- Sometimes the exigencies of the trade require that there should be no draft, as in the handling of carbon filaments for incandescent lamps, and then the conditions of the atmosphere become acutely unhealthy. In addition, in some of the rooms numerous bunsen burners are always lighted and all currents of air carefully excluded to prevent their flickering.[67]