134 Market Gardening. 



about ten days apart, from time to time, throughout 

 the season, so as to give a continuous supply of plants. 

 Lettuce seed is very small, and when sown under glass 

 requires but little covering. One ounce of good seed 



lack Seeded Tennis-Bail. 



is sufficient for four sashes of the ordinary size, three 

 feet by six. 



The culture of Lettuce, as an out-door crop, is com- 

 paratively easy ; but when grown under glass it is a 

 much more difficult crop to raise, as through the winter 

 season, when the days are short and there is much 

 cloudy weather, the crop is likely to be affected with 

 mildew and the green-fly. 



This green fly, or louse, is a most difficult insect to 

 manage, especially when the plants have gained a 

 considerable size. The only way to keep rid of them is 

 to fumigate the houses thoroughly with the smoke of 

 tobacco stems. This should be done three nights in 

 succession. In order to make sure of accomplishing 

 the work, in a week or ten days after the third smoking 



