u 



The following tables explain themselves. 

 Table No. 1. 



Table No. 2. 



The temperature is registered by Fahrenheit thermometer. 



The sashes remained on during the day, and were equally covered at 

 night with mats and shutters. 



Conclusion. 



The conclusions reached in the above experiments are : — 

 1st. That the glass gives the greatest amount of protection from the 



cold. 

 2d, That the heat accumulates most rapidly under glass when the sun 

 shines, and is best prevented from escaping from the heating ma- 

 terial in the bed at night. 



