69 



insect the red spider makes the most rapid pro- 

 gress ; on account of the necessity there exists, 

 of keeping the houses close, and supporting a 

 dry, "warm air : both of which circumstances 

 are particularly congenial to its nature ; there- 

 fore, on all fine, mild mornings, observe to raise 

 a powerful steam in the house, as already di- 

 rected ; by the frequent repetition of which, 

 there wiil be a possibility of keeping them under 

 controul. 



As the internal strength, and heat of the tan, 

 will now be much on the decline, in conse- 

 quence of the length of time it has been in use, 

 it will be requisite to turn it more frequently ; 

 so that about the beginning of March, I would 

 advise its being again stirred, to at least half 

 its depth ; which will afford a temperate heat, 

 until the time in which the plants are usually 

 shifted, when it is generally renewed. 



Some gardeners make it a practice, to have 

 merely the upper half of their tan pits stirred, 

 at any time, throughout the year, when the heat 

 happens to be on the decline : this is certainly 

 a very proper method, where there is plenty of 

 time, and hands to perform it ; as there is no 

 danger of a burning heat arising ; but it requires 



