42 EFFORTS OF SCIENTISTS. 



certain modifications, be applicable to almost every building 

 from the palace to the cottage. 



Accustomed to view such subjects from a common-sense 

 point of view, he at once arrived at the conclusion that any 

 apparatus to be generally adopted and always efficient must 

 be as permanent as the building to which it would have to 

 be connected, and with this guiding principle to direct his 

 efforts he resolved to exert- his inventive faculties in search 

 of the much-needed ventilator. 



It was no easy task ; but with the assistance of his son he 

 succeeded beyond his most sanguine expectations. 



To find a suitable remedy for the poisoned air which 

 thousands nay, millions of people were daily inhaling was 

 probably the lesser half of the great work to be accomplished. 



To convince the world of its fatal errors; to make 

 people understand the presence of deadly influences, which 

 they cannot see and do not immediately feel; to arouse 

 the public mind to a proper appreciation of the grave 

 consequences resulting from imperfect ventilation these 

 were tasks which required no ordinary ability, energy, 

 and singleness of purpose to accomplish. 



Thanks to the efforts of Dr. Richardson, Prof. Du 

 Chaumont, Prof. Oorfield, and other distinguished men of 

 science, we have no excuse for continued apathy on such 

 matters ; but even now it is terrible to contemplate the 



