CONDITIONS FOR SUCCESS. 197 



they will develop much weaker plants than will be 

 obtained from large, plurnp seed. When transplanting, 

 the weak plants should be rejected, and in this way an 

 even stand of plants will be secured that will be ready 

 for cutting at the same time, thus both securing a better 

 crop and a saving in time. 



(.'}.) Careful attention to regulating the tempera- 

 ture at night and to ventilation during the day. The 

 burning of the edges of the leaves, which is so trouble- 

 some with head lettuce, is undoubtedly due to some neg- 

 lect in these particulars. Sixty degrees answers well as 

 a day temperature, but even at this, air should be given, 

 and if it rises higher the ventilators should be 

 opened wide. 



(4.) Securing a steady growth of the plants and 

 guarding against a check. Aside from the top-dressing 

 that is desirable after each crop is taken off, the applica- 

 tion of a little ground bone, wood ashes and nitrate of 

 soda to the surface, will both increase the size of the 

 plants and hasten their maturity. 



(5.) So handling the houses that insects and fun- 

 gous diseases cannot gain a foothold. 



