xiv 



CONTENTS. 



The apparent use of the infinite seedling varieties of 

 plants, ..... P. 307 



VII. — Cruickshank's Practical Planter, . 309 



Advantages of laying ground under timber, stated 

 rather too high by Mr Cruickshank, . . ib. 



Mr Cruickshank's account of the superior fertilizing 



influence of forest upon the soil, . .310 



Facts which in many cases lead to an opposite con- 

 clusion, . . . . '316 



An examination into the causes which promote or 

 retard the formation, or which tend to dissipate 

 the earth's covering of vegetable mould, . 316 



Account of an uncommon system of fallowing once 

 practised iu the Carse of Gowrie, . . 324 



High manuring quality of old clay walls, . 325 



Formation of nitre the probable cause of the fertiliz- 

 ing quality of these walls, . . . ib. 



The fertilizing influence of summer fallow may in 

 part be owing to the formation of nitre and other 

 salts, . . . . . . ib. 



That there is a deficiency of these salts in some places 

 of the world, and an excess in others, . . 326 



Ignorance of Mr Cruickshank regarding the location 

 of certain kinds of trees, . . . 327 



Mr Cruickshank's reprehension of the practice of co- 

 vering fir seeds half an inch deep in England, and 

 and of forcing suitable earth for nui^series where 

 awanting. ..... 330 



Best method of transplanting seedlings in the nur- 

 sery row, . . . . .33] 



Quotation worthy the attention of planters, . ib. 



Error of authors on the location of trees, in incul- 

 cating a determinate character of soil as generally 

 necessaiy for each kind of tree, . . 334 



Further errors of Mr Cruickshank on the location of 

 trees, . . . . . .335 



Adaptation of Scots fir to moist soils, even to peat- 

 moss, ...... 338 



