100 



VEGETABLE GARDENING 



is required when hotbeds are heated in this way than when 

 manure is used as a source of heat. 



A Greenhouse Hotbed. A greenhouse may be heated 

 by manure or a combination of manure and other artificial 

 heat. In the following lines and illustrations is given the 

 plan of what may be called a greenhouse hotbed which has 



ELev/mon. 



BED. 



PATH. 



BED. 



n/w. 



Fig. 37. Plan and elevation of hotbed greenhouse. 



been in very successful operation at the Minnesota Agri- 

 cultural School. The description is from an article on the 

 subject by R. S. Mackintosh, Extension Horticulturist. 



"There are disadvantages in hotbeds, as, for instance, 

 the transplanting, ventilating, watering, etc., must be done 

 from the outside even in severe weather, while in a house 

 like the one shown in the figure these operations can be 

 carried on easily. The house is simply a hotbed built so 



