67 



button. Each of the shutters should have a project- 

 ing fillet fixed on one side, so as to shut close over the 

 adjoining one. The shutters themselves should of 

 course be made of light frame-work, strengthened 

 where necessary, with small iron rods. The material 

 used for covering them may be the asphalte felt, now 

 manufactured extensively for roofing purposes, or 

 strong brown paper, coated with tar ; the latter is used 

 extensively in Germany for this purpose, and is found 

 to be very durable and cheap ; it is there even pre- 

 ferred to every other material. 



Though the covering of hot-houses has been already 

 practised in some cases, I am not aware of any one hav- 

 ing adopted a close covering with the view to facilitate 

 ventilation or aeration during the night. It appears 

 to me that the circulation of air, secured by the means 

 here proposed, would have much influence in exclud- 

 ing cold, whilst at the same time it would prevent the 

 interior from becoming too warm and close. 



On Transplanting and the use of Turf Pots. 



I have, at p. 26, given what appear to me to be 

 some of the principal reasons against the practice of 

 transplanting, or planting out, Cucumber and other 

 plants. When this is done after any quantity of roots 

 are produced, some injury or check must be sustained 

 during- the process ; and checks of this kind are op- 

 posed to the realisation of the greatest results within 

 the shortest period, which of course is the great object 

 in view. Where it is inconvenient to plant the seeds 

 in the places the plants are intended to occupy, or to 

 put out the young plants during the earliest period of 

 their development, or where propagation by cuttings 

 or layers, is adopted, and the plants of course have to 

 be potted separately, so as to be in a removable state, 



