INDEX. 361 



SECTION V. 



MATERIALS OF CONSTRUCTION. 



Workmanship. Bad foundations, &c. Temporary nature of horticultural 

 erections. Consequence of bad constructed houses. Superior workmanship. 



Economy of building substantial houses, 99 



Materials of const rueaon. Most suitable materials for building hot-houses. 



Metallic houses Superior to wood. Opposition to iron hot-houses. 

 Objections raised. Objections answered. Expansibility of copper Of 

 iron. Power of metals to conduct heat. Electricity an objection. Cost 

 of iron hot-houses. Mr. Ressor's iron vinery. Horticultural structures in 

 Europe of iron. Transportability of materials, &c., 101 



SECTION VI. 



GLASS. 



The physical properties of transparent bodies. Glass of the palm-house at 

 Kew. Report of Mr. Hunt, from Silliman's Journal of Science. Calorific 

 influence of the glass chosen. Action of the non-luminous rays of light. 

 Green glass of Melloni, 106 



Evils consequent on -employing bad glass in hot-houses. Knotted and 

 wavy glass. Its effects. Resources against bad glass. Painting and shad- 

 ing the glass. Inconveniencies attending both these methods. Utility of 

 using good glass. Propriety of manufacturers of glass making good mate- 

 rial, 109 



Glazing. Size of laps. Glazing roof-sashes,. Objectionable nature of 

 broad laps. The most approved method of making laps. Curvilinear glaz- 

 ing. Reversed curvilinear glazing. Puttying the laps. Glaring ridge aod 

 furrow roofs. Anomalous surfaces, 110 



Color of walls. Considerations in favor of a dark color. Influence of 

 reflected light on dark walls. Retention of heat by dark-colored walls. 

 Color of the rafters. Painting of the wood-work of the house with an anti- 

 corrosive solution, 113 



SECTION VII. 

 FORMATION OF GARDENS. 



Form of the garden and disposition of the ground. Considerations neces- 

 sary for fixing on the site. Walks. Entrance-walk. Formation of walks. 

 Different kinds of walks. The durability and comfort of walks. Materials 

 for the surface of walks. Form of the surface. Edges of walks, . . . .116 



Borders and compartments. Width and size of do. General rule for lay- 

 ing down borders. Size and number of compartments. Bad effects of small 

 walks, . 119 



Walls their 'ise. Forms of walls. Their height. Gardens of Mr. 

 Cushing, at Watertown. Hot and flued walls. Wooden fences. Com- 

 parative economy dt walls and fences, 121 



