GREENHOUSES AND FRAMES 225 



condenses on the glass the sash should be lifted a trifle on the side 

 away from the prevailing wind. Sashes should be capable of being 

 raised at any angle. Much damage can be done by leaving the frame 

 closed tightly on sunny days, for the crops are easily burned. 



The watering should be done on sunny mornings. When the 

 plants have produced their third leaf they should be transplanted 

 according to their various needs. Lettuce will, perhaps, be matured 

 in the frames and will need to stand eight inches apart, while Tomatoes 



A well-sheltered line of cold frames facing due south. How itivaluable.lthey are 



may be set out three inches apart and transplanted again. On real 

 cold nights the hotbeds should be covered with some sort of mat, 

 either of straw or padded cloth. 



Prof. Wilkinson of Cornell University gives the following discussion 

 of vegetable combinations that can be grown in a hotbed (see p. 161): 



" Radishes, Lettuce, Beets and Carrots seem well adapted for 

 growing together, while Tomatoes, Egg-plants and Peppers, although 

 they can be raised with the others, will grow better if given a higher 

 temperature than, and conditions slightly different from, those required 

 by the first four plants named. Through experience the various 

 requirements of different plants will become known to the grower. 



