By Mr, John Dick. 



167 



ature of the frame *can be ascertained by inserting the thermometer 

 in the middle box H ; ventilation can be effected by the end boxes, 

 H H ; warmth can be renewed or increased, if necessary, by the 

 exchange of a little of the dung, when cooling, for some fresh ; the 

 frame keeps the border in which the plants are growing dry, and 

 prevents its being chilled by being soaked with rain ; all of which 

 are important advantages that do not attend the use of earthen 

 covers. 



When the forcing begins, the thermometer should be kept about 

 60°, afterwards it may gradually advance to 65° or 70°, regulating it 

 according to the objects the Gardener may happen to have in view. 



It is better that frames of this kind should not be too large ; I 

 prefer them only twelve feet long, as they are easily lifted about 

 without the joints being broken bytwisting. The wood of which 

 they are constructed ought not to be less than five-eights or three- 

 fourths of an inch thick. 



Fig. 2. is a plan of the same frame adapted to forcing Asparagus 

 in beds, and the description of Fig. 1. applies equally to it. 



I_ 



G 



E 



G 



4 



I. 2XD SERIES. 



z 



