ON WARMING AND VENTILATION. 335 



Railway stations ought to be ventilated by means of lanterns 

 placed up high. 



With regard to workshops and laboratories, it is merely necessary 

 to apply the general rules mentioned above. 



Glass roofs and ceilings are inconvenient inasmuch as they allow 

 the interior air to become much heated in summer, and very cool in- 

 winter. They ought to be double. In the winter season it is necessary 

 to heat a room with a glass roof from 300 to 400. 



In kitchens the heat which is wasted by the stoves may be employed 

 to warm baths. 



Water-closets can easily be ventilated by means of gas burners. 



The lecture-rooms of the " Conservatoire des Arts et Metiers" have 

 for eight years been warmed and ventilated according to the principles 

 of the above-named system. Air is introduced by the ceiling at the 

 rate of about o M. 50 in i" ami at a temperature of from 18 to 20. 



In the interior, the temperature is kept between 18 and 22 at the 

 most. The volume of air got rid of is 25 M.c. per hour and per indi- 

 vidual, when the amphitheatre is perfectly full. 



In summer the renewal of the air keeps the temperature 2 or 3^ 

 below that of the external air. 



As an example of the advantages to be derived from good ventila- 

 tion, Dr. Reid, quotes, in his work, the agreeable effect produced in 

 the Banquetting Hall of the Royal Society of Edinburgh, by the system 

 which he had introduced. 



At one of the entertainments, at which fifty guests were present, the 

 comfort produced by the renewal of air had the effect of keeping up 

 the flow of spirits and the appetite of the assembly, to such an extent 

 that the consumption of liquids was greatly increased and the number 

 of carriages required to carry the members home was doubled. But 

 the good doctor adds that these gentle excesses did harm to no one. 



General Morin winds up by invoking the assistance of the ladies 

 who are as much interested in the matter, as any one in order to 

 carry out all necessary measures for ensuring the healthiness of all 

 inhabited places. 



Drawing-rooms and ball-rooms, magnificently lit up, decorated with 

 flowers and filled with noble youths and lovely maidens, are no less 

 dangerous for the health of the body, than for the peace of the soul. 



