84 EXPERIMENTS BY AN EMINENT LONDON PHYSICIAN. 



of the Council have personally thanked Mr. Boyle for the 

 benefits they have derived, from a healthful point of 

 view, from the application of the system. From a large 

 number of equally favourable letters received from inde- 

 pendent sources we abstract the following from an eminent 

 London physician and sanitarian : 



"After thoroughly testing and examining your system of 

 ventilation as applied to the Council Chamber of the Guild- 

 hall, I have great pleasure in being able to say that I am in 

 every way satisfied with the result. It is, in my estimation, 

 the most perfect system yet introduced, and I greatly doubt 

 there being any room for improvement upon it. The fact of 

 your appliances being entirely self-acting and having no 

 movable parts liable to get out of order after having been 

 placed is a great boon, as it renders any after-cost or atten- 

 tion unnecessary. During the time that I have devoted to- 

 testing your appliances I have always found them entirely 

 free from down-draught, a feature I have not found in any 

 other system, and which I opine to be of the greatest 

 advantage, as it not only serves to ventilate the building 

 more thoroughly, but furthermore maintains an even temper- 

 ature therein, which no sudden change of weather can affect. 

 My pursuits have rendered me practically acquainted with 

 many systems of ventilation now in use, both automatic and 

 otherwise, and after careful examination I have arrived at 



