12 OBSERVATIONS ON VENTILATION. [October, 



cause it to flow in only by proper prearranged openings, 

 which will inevitably result, as a natural consequence, if 

 the openings are conveniently adapted. The fire produces 

 heat, or, as a natural result, consumes air. I will not mys- 

 tify the question by dealing with the gases, etc., these 

 can be followed naturally by the initiated. I am writing 

 simply for those who care not for the rationale, but wish 

 for facts and proofs resulting. 



It is not requisite that this pure air should be of 

 such a low temperature as to cause, not only unpleasant, 

 but unwholesome condensation and inconvenience to the 

 lungs of those compelled to remain between decks ; nor 

 do I consider it, from my personal experience of last 

 year, at all requisite to have extra holes to admit the cold 

 air, when it defies our efforts to keep up a convenient 

 or comfortable temperature. The idea of ventilation 

 may drive a man too far even to absurdity, and uncon- 

 sciously induce disease at the moment he fancies himself 

 the promoter of health. But we have nothing to do with 

 robust men and their powerful lungs ; we know that we 

 have some very weak lungs ; indeed we fear the result 

 of this winter, and more particularly if we should be as 

 damp between decks as last. Even at the moment I pen 

 these remarks, I am told that in every direction, and be- 

 fore half our trial is prosecuted, and we have already 

 experienced a pretty good taste of damp in August and 

 September," the lower deck is infinitely drier and more 

 comfortable !" 



I cannot lose sight of this excess of ventilation without 

 stating that I enjoyed good health, had a dry cabin, but 

 more cold air than I could keep out, disturbing my ivst 



