VEGETABLES RAISED FOR MARKET 



been learned, and much yet remains to be explored; 

 and in the very many obscure conditions affecting 

 health and growth, quality and quantity of product, 

 and the like. 



As instances of appliances already in universal 

 use amongst market gardeners, yet susceptible 

 of indefinite further modifications and improve- 

 ment, may be mentioned forcing- houses and 

 hot-beds. Both of these, in their many and very 

 various details of construction and operation, 

 obviously need to be studied as separate (and 

 far from simple) subjects of further inquiry and 

 comparison. On the choice between greenhouse 

 and hot-bed growing, in any case, or between 

 the many different practicable ways of putting 

 up and operating either, may depend many results 

 involving the true or false economy of the plan; 

 and thus the pecuniary success or failure of the 

 grower. 



Thus far in the present work I have had in 

 mind, and mainly confined myself to describing, 

 the growing of crops and use of means and pro- 

 cesses which I could recommend as successful 

 from a sufficiently extended experience of my own. 

 In the pages that are to follow, I propose to include, 



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