REPORT OF THE BOARD OF RAPID TRANSIT RAILROAD COMMISSIONERS FOR THE CITY OF NEW YORK FOR THE YEAR ENDING DECEMBER 31, [1901-]1906. ACCOMPANIED BY REPORTS OF THE CHIEF ENGINEER AND OF THE AUDITOR Read & Download for free Book by New York (N.Y.). Board of Rapid Transit Railroad Commissioners

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Results of Oxygen Determinaiwn.
The samples of subway air which were analyzed for oxygen were collected from 9:30 a. m. to 5:05 p. m., between Brooklyn Bridge and Ninety-sixth Street Stations.
The average amount of oxygen found in the air of the streets was 20.71 per cent.; in the subway 20.60; difference .11. The least amount found in the subway was 20.25.
Bacterial Condition of the Air.
The studies which I made concerning the bacteria in the subway relate almost solely to their number. It was... not practicable, with- in the time and scope planned for this investigation, to do more.
Mv views upon the desirability of further bacteriological studies were set forth in reports submitted to your Board and your Chief Engineer in November and December.
The Qxiantitative Methods Employed.
The bacteria were collected by allowing them to settle from the air upon circular plates about 3J'2 inches in diameter, containing a standard agar culture medium, or by straining them from the air by means of sand filters.

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