162 LETTUCE. 



Curled Silesia and more reliable for field-culture. 

 It has been grown extensively in cold frames, but it 

 is not a good variety for forcing with bottom-heat. 

 It is grown, in preference to any other, by market- 

 gardeners, for a Spring crop among Cabbages and 

 Cauliflowers. It is an excellent kind for Spring 

 planting in the kitchen-garden. 



Tennis Bai.l. — This ^'ariety forms a small, solid 

 head, and is a very superior kind for forcing-pur- 

 poses, for which it is extensively used. The Iea\es 

 are nearly smooth, and, when full grown, the head 

 is tender, juicy, and crisp. 



Boston Head Lettuce. — The variety known to 

 gardeners by this name is a white-seeded butter. 

 The leaves are smooth. It forms a head one quar- 

 ter larger than the Tennis Ball, and is a reliable 

 kind for forcing. It is popular in market on account 

 of its size and quality. 



Black Seeded Buttee forms a large head when 

 planted in the open ground in Spring ; it will not 

 stand bottom-heat, and it is, therefore of very little 

 use for forcing. But it is extensively grown in the 

 garden and field, and is one of the most profitable 

 for this purpose. 



Beown Dutch is a hardy sort, that will stand the 

 Winter better than otlier kinds that we grow. 



Laege Indian grows large in the open ground, 

 and stands the Summer heat better tlian any other 

 of the good varieties. It has a curled leaf, lighter 

 in color than the Silesia, and is a popular Summer 

 kind. 



Paeis Geeen Cos. — This variety of the Cos is 



