360 L\UEX. 



principles. — Error committed in laying hot-houst roofs too flat. — Table show- 

 ing the number of rays reflected at different angles. — Circumstances on which 

 the slope of roofs depends, ' 34 



SECTION III. 



STRUCTURES ADAPTED TO PARTICULAR PURPOSES 



Forcing-houses, culinary-houses, &c. — Purposes of their erection. — Section 

 of a forcing-pit figured and described. — Large forcing-pit figured and described. 

 — Dimensions of winter forcing-houses. — Skill required in the forcing of fruit 

 in winter. — Polyprosopic forcing-houses figured and described. — Advantages 

 of polyprosopic roofs, 39 



Pits. — The Cambridge pit. — Saunders' forcing-pit figured and described. — 

 Curvilinear roofed cold pits. — Dung beds. — Temporary frames. — Plant pro- 

 tectors. — Figures and descriptions of them, 43 



Framing ground. — Its purposes. — General condition of this department. — 

 Appropriate site for it. — Ground plan and disposition of framing ground, . 49 



Orangeries, graperies, &c. — Latitude 2:iven in their construction. — Repre- 

 sentation of a range of cold-houses at Clifton Park. — Size of cold-houses. — 

 Figures of lean-to and span-roofed houses. — Figures of double and sinsle- 

 roofed curvilinear houses, 54 



Objections raised against curvilinear houses in England. — Properties pos- 

 sessed by curvilinear houses. — Reflection and refracCiori of light liy them. — 

 Their adaptability for grape-growing. — Gable ends. — Objections to them. . 58 



Polyprosopic houses. — Figures and descriptions of do. — Double-roofed 

 houses of this kind. — Cold vineries. — Disadvantages attending them. — 

 Front wall of hot-houses. — The height of do. -r- Objections to upright fronts. — 

 parapet walls, 60 



Ridge and furrow-roofed houses. — Figure and description of a house of this 

 kind. — Directions for building rirlges and furrows. — Glazing of do. — Aavan- 

 lages of do. — Principle of their construction, 64 



Cold vineries. — Range of small houses figured and described. — Advantages 

 of small houses over large ones, 67 



Green-houseSj conservatories, &c. — Distinction between green-houses and 

 conservatories. — Amalgamation of the two together. — Appropriation of green- 

 houses in summer. — Span-roofed green-houses preferable to single-roofed ones. 

 — Beauty of well-grown plants. — Impossibility of growing plants well in opaque 

 houses. — Proportions of a green-house, 73 



Plan of green-house, and description. — Prospective view of green-house. — 

 Range of green-houses. — Height of plant-houses. — Errors in making them too 

 high. — Conservatory at Regent's Park Botanic Garden. — Principles of design 

 and taste displayed. — Advantages of low-roofed plant-houses, 76 



SECTION IV. 



INTERIOR ARRANGEMENTS. 



Arrangements for forcing-houses, culinary-houses, &c. — Trellises and meth- 

 ods of fixing trellises. — Roof trellises. — Centre trellises. — Cross trellises. 

 — Trellises for double houses, 84 



Interior of greenhouses. — Slope of ijreen-house stages. — Green-houses for 

 promiscuous plants. — Width and height of green-house shelves. — Stages for 

 small plants* 6lc., 87 



Conservatories, Orangeries, &c. — Houses for growing large plants. — Con- 

 servatory beds. — Level of do. — Objections to the general form of conserva- 

 tory beds. — Irregular method of laying out the interior of conservatories. — 

 This method illustrated in the conservatory at the Royal Botanic Garden, Re- 

 gent's Park. — Ground plan of a conservatory laid out in the irregular style. — 

 Advantages resulting from this method, 89 



