THE CANADIAN HORTICULTURIST, 191 



Tenth. — What varieties of sweet potatoes can be successfully 

 grown in Ontario, and what is the best method of treatment ? 



Eleventh. — -Whicli are the five best and most profitable varieties 

 of potatoe ? 



Twelfth. — Wiiich arc the five best varieties of table peas ? 



Thirteenth. — Can any of our native nut-bearing trees be profitably 

 Itivated, either for the nuts or timber, and where is the northern 

 limit of each ? 



SCREENS. 



The common process is to go to the forest, select such young trees as 

 seeHi adiii)ted to the purpose, dig them by cutting off all the roots at a few 

 inches distance from the trunk, thus cutting away probaV)ly nine-tenths of 

 the entii'e root systenJ; remove them from the shade and .shelter of other 

 trees, and probably trlnsfer them to the open ground, where they, while 

 yet enfeebled by the pi-ocess, must be subjected to the full power of the 

 summer's sun and wind. This is doubtless many times done as a matter 

 of economy, although after such trees have died and been several times- 

 i-eplaced with the loss of several years time, as is usually the case, theie 

 would seem to be abundant reason to doubt the wisdom and even the 

 economy of the process. 



Nursery-gi'own trees are usually thickly grown in the seed bed, and 

 when but one or two years old are taken up, the roots cut back and the 

 seedlings thickly planted ia rows, where they are allowed to stand till they 

 demand more space, when they are again transplanted, and as a necessity 

 the I'oots are again shortened and they are given a wider space for growth. 

 Trees grown in this manrier are invariably found to have a dense mass of 

 fibrous roots, and hence can be transplanted with greater certainty, and 

 will, moreover, recover from the shock of removal with far greater 

 pi'omptness. Such trees are also mere fully hardened by exposure to the 

 sun — a fact which adds greatly to their ability to bear the shock of removal. 



In growing young evergreens it is found necessar}' to protect them from 

 the full influence of the sun fors^ considerable period, till by degrees they 

 acquire strength to witl^pjjjSSPnffio exposure. These also undergo two or 

 three transplan tings before they acquire the proper size, so that even those 

 most im{)atient of removal become prepai-ed to undergo the process with 

 comparative impunity — a preparation the more needful in the case of 

 evergi'eens for the reji.'^on that, unlike deciduous ti'ees, there is no time in 

 whieh they are not subject to the drain upon their vitality, arising from 

 the evaporation of moisture through their persistent foliage, and, therefore, 

 this tax uj>on their vitality is so much added to the shock of i-emoval. 



There is, however, no longer occasion, as a matter of even the closest 

 economy, to resort to the forest for a supply, since nursery-grown trees are 

 offered at prices little if any above the value of the labor necessary to 

 ■;uove them from the forest. 



