TEMPERATURE AND VENTILATION. 243 



3 pollination is more perfect if the air is warm and 



Fertilization is aided by giving the vines a thor- 



b jarring. The pollen is generally shed in greatest 



ndance by the anthers during the forenoon of bright 



i,ys, and its distribution can be assisted by giving thor- 



-ugh ventilation, which will remove all surplus moisture 



from the air. 



As the bunches develop, the air should be kept 

 moist by the free use of water upon the border, etc., but 

 syringing the foliage at this time is not to be recom- 

 mended, particularly with bearing vines. During the 

 ripening period the air should again be dry, and water 

 should be very sparingly used. 



TEMPERATURE AND VENTILATION. 



Ventilation is not only for the purpose of regulat- 

 ing the temperature of the houses during the day, but it 

 serves to admit fresh air and also, to some extent, con- 

 trols the moisture in the air. The air should be 

 admitted on bright mornings as soon as the sun is well 

 up, and the amount of ventilation should be gradually 

 increased as the season advances. In pleasant weather, 

 the ventilators may remain open at night, but, although 

 grapes have been grown with success in houses where 

 the ventilators are opened in the spring and not closed 

 until fall, it is better to regulate them according to the 

 weather, and in cold, wet spells, such as occur fre- 

 quently, the houses will be better off if closed. 



In the hot vinery, although the house should be 

 opened to admit fresh air, the amount of ventilation 

 desirable is considerably less than in cool graperies. 

 When first started, the hot graperies should be given a 

 temperature of about 50 degrees at night, with from 65 

 to 70 degrees during the day. This should be raised in 

 three or four weeks to 60 degrees at night, and it may 

 be 75 to 80 degress, or even more, during the day. On 



