EFFECTS OF DEFICIENT VENTILATION. 1.83 



thoroughly chilled, and perhaps fatal illness is in- 

 duced ; and, unfortunately, even at such a price, the 

 relief is only partial ; for the windows being all on 

 one side of the room, and not extending much above 

 half-way to the ceiling, complete ventilation is im- 

 practicable. 



In dwelling-houses lighted by gas, the frequent 

 renewal of the air acquires increased importance 

 A single gas-burner will consume more oxygen, an 

 produce more carbonic acid to deteriorate the atmo- 

 sphere of a room, than six or eight candles. * If, 

 therefore, where several burners are used, no pro- 

 vision be made for the escape of the corrupted air, 

 and for the introduction of pure air from without, 

 the health will necessarily suffer. A ventilator 

 placed over the burners, like an inverted funnel, and 

 opening into the chimney, is an efficient and easy 

 remedy for the former evil ; and a small tube form- 

 ing a communication between the external air and 

 the room would supply fresh air, where necessary. 

 The tube might be made to pass, like a distiller's 

 worm, through a vessel containing hot water, by 

 which means the air might be heated, in very cold 

 weather, before being thrown into the room, and 

 thus the danger arising from cold draughts and in- 

 equalities of temperature be avoided. 



Many of our churches and schools are extremely 

 ill ventilated ; and accordingly it is observed, that 

 fainting and hysterics occur in churches much more 

 frequently in the afternoon than in the forenoon, be- 

 *ause the air is then in its maximum of vitiation. 

 Indeed, it is impossible to look around us in a 

 crowded church, towards the close of the service, 

 without perceiving the effects of deficient air in the 

 expression of the features of every one present. 

 Either a relaxed sallow paleness of the surface, or 

 Hie hectic flush of fever, is observable ; and, as the 

 pecesearv accompaniment, a sensation of mental 



