SECT. XIII. OF HOT BEDS.. 179 



Syringa, or Mack Orange, and ffypericum frutex, 

 bear along the sides, as well as ends, of old wood, 

 and of course may freely be shortened. 



Spirea frutex, Guddtr rose, and many others, 

 bear on shoots of the year, and may therefore be 

 pruned short. 



Pyracantha bears (chiefly) on two and three 

 years old wood ; therefore the oldest wood is to be 

 cut out, and young in every part retained at length. 

 The time of pruning should be autumn; but early 

 in spring will do, as the flowers may then be seen. 



For the pruning forest trees, see page 124. Bar- 

 berries, see page 174. 



SECTION XIII. 



OF HOT BEDS. 



J- HE dung of animals, but chiefly of horses, is put 

 together for fermentation, in order to form bodies of 

 heat for two purposes. 1 . To raise, vegetables, flow- 

 ers, c. not otherwise to be produced, or, at least, 

 not in perfection. 2. To raise such things, as though 

 they come in perfection by open culture, yet may be 

 forwarded by artificial warmth. 



According to the quantity and qualtty of the mate- 

 rials put together for hot beds, the heat will be pro- 

 portioned as to strength and duration ; and by a 

 judicious use in making, and the management after- 

 wards, many advantages may be obtained from them. 

 Tiie great point is, to suit the degree of heat to the 

 nature of the different plants to be cultivated, that 



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