THE GARDENER. 



31 



its surface. Hence in covering sashes with mats, a 

 great advantage is obtained by laying straw between 

 the mats and the glass, or by any other means of keep- 

 ing the mat a few inches above the frame. Hence 

 also, when the branches of trees are to be protected 

 by mats, they will be rendered much more efficient if 

 first surrounded by straw, fern, or some other light 

 body, which contains in its interstices a good deal of 

 air. It should be borne in mind," Professor Daniell ob- 

 serves, " that the radiation is only transferred from 

 the tree to the mat, and the cold of the latter will be 

 conducted to the former in every point where it 

 touches. Contact should therefore be prevented by 

 hoops or other means properly applied, and the stratum 

 of air which is inclosed will, by its low conducting 

 power, effectually secure the plant. With their foliage 

 thus protected, and the roots well covered with litter, 

 many evergreens might doubtless be brought to sur- 

 vive the rigour of our winters, which are now confined 

 to the greenhouse and conservatory.'' — Horticultural 

 Transactions^ vol. 6. 



All frames should be so placed in the garden as to 

 have the morning and the mid-day sun, and to allow 

 room for going round them to open and shut the sashes, 

 and apply linings when needed. A low sunk bed, fac- 

 ing the north east, is useful for Azaleas, Khododen- 

 drons, and Kalmias, and some Heaths that love the 

 shade, and for cuttings which strike better without 

 exposure to the sun — nay, there are plants which do 

 better with the northern aspect always. 



Supposing that you find it requisite to plunge some 

 plants that have suffered in their health elsewhere for 

 revival, do not push them too much by heat, moisture, 

 and confinement ; for although such means may serve 

 their appearance for a time, yet their health will be 

 injured, as will be manifested after they are taken 

 away by your customers, supposing you propagate for 



