THE CULTURE OF THE GRAPE. 67 



the clay, if dull weather. In clear weather, from the 

 commencement of forcing, I open the upper door of the 

 furnace, merely keeping the fire in during the day, and 

 allow the temperature to rise in the hothouse to T0°, Y5°, 

 or even 80°- "Were there a continuance of clear weather 

 at this stage of forcing, 80° would be too high ; but, for 

 a day or two, it does not matter, although the thermome- 

 ter should rise to 80° in the middle of the day. This 

 temperature should be continued during the day, should 

 the weather be clear, until the first leaves of the vine are 

 fully expanded, when the temperature may be kept be- 

 tween 85° and 90° in the daytime in clear weather. 

 "When the vines are in flower, I keep the temperature be- 

 tween 55° and 60° in the morning, and between 65° and 

 70° during the day, if dull weather, and about 85° if sun- 

 shine. After the grapes are set, the thermometer may 

 be allowed to rise to 90° or 95° during the day in clear 

 weather. In dull or wet weather, in summer, instead of 

 kindling fires at night in the ordinary way, I cause the 

 flues to be heated in the morning in order to raise the 

 mercury in the thermometer to about Y0° during the day, 

 and allow the fire to burn out towards night. The tem- 

 perature in the daytime, from the commencement of forc- 

 ing, should be regulated, in some measure, by the heat 

 of the vinehouse during the night. For example, if the 

 house has been colder during the night than I could wish, 

 I keep up a greater heat than usual during the following 

 day ; and, if it has been warmer during the night than I 

 consider requisite, I give less fire during the day than 

 usual ; or more air, according to the state of the weather- 

 " Many may object to the lowness of the temperature 



