334 WARMING AND VENTILATION. 



wing contaiuing 106 beds, during the night, and, every evening, the 

 amount during the day. 



Methods of observation of this kind, automatic and independent of 

 the personal action of the employes, are the indispensable adjuncts of 

 great ventilating systems, if it be desired that the service be performed 

 in a regular manner. They also serve to render the work of inspection 

 by the heads of the establishment more easy and efficient. 



Errata in previous portion of this article contained in the report for 1873 : 



In § 31, pp. 308, 309, for 1,000 cubic feet iveigli, read one cubic foot xmighs ; and for 



weight of 1,000 cubic feet, read iveight of one cubic foot. 

 In § 35, pp.310, 311, for 0.000075G, 0.000081, 0.000005, 0.000077, 0.000074, 0.000003, read 



0.0750, 0.081, 0.005, 0.077, 0.074, 0.003 respectively. 



