448 BOARD OF AGRICULTURE. [Pub. Doc. 



absorption and giving off the water by the plant, together 

 with tlie conditions which govern the formation of the tex- 

 ture of lettuce, namely, heat, light, etc. To obviate top 

 burn, care must be taken not to allow high day temperatures 

 during or directly after cloudy days, and low night tempera- 

 tures should be maintained during cloudy weather. Skilled 



lettuce growers know the textm-e 

 of their plants, and what treatment 

 they are capable of standing. The 

 temperature conditions are gov- 

 erned entirely by what they think 

 the plant is capable of enduring. 

 Where a rapid growth of lettuce 

 takes place, in consequence of any 

 form of stimulation, care should be 



FIG. 8. -Top burn of lettuce, taken to gOVCm temperature con- 

 characterized by a browning or fii^ions, especially those of night 



blackening of the edges of the ' i ./ o 



leaves lu the head. temperature. Lettuce plants, -like 



all others, make most of their 

 growth during the night, and the character or texture of that 

 growth is dependent to a large extent upon temperature. 

 High night temperature will cause rapid growth and a deli- 

 cate texture, and lower temperature will give rise to less 

 growth with a firmer texture. 



Chrysanthemums. 



Powder}/ Mildeir ( Ert/.'^iphe Cic/iomceanim, DC). 



Mildew frecjuently shows itself to a slight extent on the 

 leaves of chrj^santhemums. It is of little consequence, how- 

 ever, to the careful grower. The mildew is similar to that 

 found on the roses, and can be held in check by the same 



means. 



Iiuf<t (Pucciiiia Chr>/sanfhemi,B,oze.). 



The first appearance of the chrysanthenmm rust in America 

 occurred in this State during the year 189G, since which 

 time it has spread over nearly the whole United States. 

 The first two or three 3 ears of the outbi-eak proved the worst, 

 and at })resent little is heard about it in this section, espe- 

 cially from our largest and best growers. Its di.sa}ipearance 



