agiog and traiuiug their powers of observation and investigation 

 which are so much needed in studying the great subjects of plant 

 growth, the diseases and insect foes we have to contend with in all 

 agricultural operations. 



PLANT BED CLOTH AS A SUBSITTUTE FOR GLASS. 



The growing interest in the use of a cheai) substitute for hot-bed 

 glass, has led to the recommendation and introduction of patent 

 waterproof cloth for this purpose. 



To determine its value, tests were made upon frames as nearly as 

 possible of the same construction and exposure. The temperature 

 was registered by government standard soil thermometers placed 

 within each ))ed. 



The period of experiment covered quite a range of temperature, 

 although at no time did it go below the freezing point. Careful 

 observations, made later, when the temperature ran lower show the 

 general results to be the same. 



The following tables explain themselves. 



TABLE NO. L 



TABLE NO. 2. 



The temperature is registered by Farcnhcit thermometer. 



