CERTAIN ELEMENTS IN NURSERY PRACTICE 189 



of conditions of weather and trade, and they insure to the 

 planter quick delivery of stock that shows no winter injury. 

 A common style of nursery cellar is shown in Fig. 207 and 

 another in 208; a combined storage- and packing-house is 

 presented in Fig. 209. The store-house is provided with ample 

 facilities for ventilation, either by means of windows along 

 the sides or flues in the roof, or both. It has an earth floor. 

 In this building, the trees^ are heeled-in very thickly in the fall. 

 They either are stood straight up, or they may be piled in tiers. 

 These tiers are made up of overlapping horizontal layers laid 



FIG. 209. Combined storage- and packing-house. 



in opposite directions. The roots of the first layer are laid 

 towards the center and damp sand thrown over them. On 

 these are laid the roots of the second layer, with the tops in 

 the opposite direction. Earth is again thrown on, when another 

 layer like the first is added. The tops, therefore, are always 

 outward. These tops should lie a little higher than the roots, 

 and in order to raise them, and also to bind the pile, scantlings 

 or boards are often laid crosswise of the layers, at the outward 

 end, at intervals. Moss may be used in place of sand, although 

 the latter is more easily obtained and kept, and is generally 

 used. In piling or cording trees in this fashion, it is important 

 that a sufficient passage or alley be left between each pile to 

 admit of free circulation of air. A passage through which a 

 man_can just pass is sufficient. A cellar one hundred feet 



