70 VEGETABLE GARDENING. 



winter, it might be an advantage to so plan it that the manure 

 from one-half could be renewed every five or six weeks. 



GREENHOUSES. 



Greenhouse is a term applied rather loosely to glass 

 structures of the larger sort having some special heating ap- 

 paratus, and used for growing plants. The more expensive 

 structures are not referred to here but only the simpler affairs, 

 such as are most economical for use in the market and home 

 garden. 



A very cheap and yet withal, serviceable greenhouse, is de- 

 scribed in "'How to Make the GardenPay" and the publishers 



of it have kindly con- 

 sented to the use of it 

 here. It is called the 

 ''Model Forcing Pit." 

 Fig. 30 shows a cross 

 section of this house 

 which is made with a 

 valley in the center, so 

 that in point of fact it 

 Figure 30.-Marketgardners greenhouses. ^ two houses. The 



total width of both houses is twenty-six feet. The alleys are 

 dug into the ground in each house eighteen inches wide 

 and eighteen inches deep and boarded up on each side. 

 The beds on each side are four feet wide and the at- 

 tendant can cultivatethemwhen standingin thealley. The peak 

 of thegreenhouse is only four and a half feet above the ground 

 level or six feet from the bottom of the alleys. The sides are only 

 one foot above the ground and are made of plank nailed to 

 cedar posts and banked upon the outside with horse manure 

 in winter. The roof is covered with movable sashes 7 or 11 

 feet long and of any convenient width. Common hotbed sash 

 (3x6 feet) might be made to answer but sash having larger 

 glass than is generally put in them, is best. * Large sized glass 

 is preferable, 12x16 inches being a good size. A light frame- 

 work for the sash to rest on, similar in construction to that 

 shown in figure of a greenhouse hotbed is necessary, and the 

 sashes should be screwed down and ventilation secured in the 

 same way as there explained. In the center at B, where the 

 two roof sections meet, the sashes rest on a plank twelve inches 



