

INDEX. 

 PART I. -CONSTRUCTION. 



SECTION I. 



SITUATION. 



Site and position. What is to be understood by site and position. Cir- 

 cumstances to affect the position of a hot-house. Avoid bare, elevated spots. 

 Reasons for so doing. For shelter. For beauty and effect, 13 



Terraces. Their origin, and use round horticultural buildings. The un- 

 sightliness of turf terraces. Architectural terraces. Description of a terrace 

 at a gentleman's residence. Effect of trees. Effect without trees. Choice 

 of position decided by other circumstances, 15 



Aspect. Best aspect for lean-to houses. Reasons for choosing a south- 

 eastern aspect. Aspect for span-roofed houses. The aspect of conserva- 

 tories. Unsuitable conservatories, 20 



SECTION II. 

 DESIGN. 



General principles. Object of hot-houses. Agents of vegetative growth. 

 Reasons wnybad structures are so generally erected in this country. Mansion 

 architects. Their incapacity for erecting horticultural buildings. Fitness for 

 the end in view. Solid, opaque conservatories. Conservatory at Brookline. 

 Absurdity of spending large sums on conservatories. Observations of an 

 architect. Massive conservatories, 25 



Light a primary object. Wonderful effects of light on vegetables. Theory 

 of the transmission of light. Rays of light reflected from transparent sur- 

 faces. Action of light upon plants. Effects of different rays. Light which 

 has permeated yellow media. Light which has permeated red media. Light 

 which has permeated blue media. Difficulty of obtaining pure colors. 

 Amount of assimilation and perspiration in plants. Necessity ot making plant- 

 houses transparent on all sides, 29 



Slope of hot-house roofs. Much depends on the angle of elevation. Prin- 

 ciples to guide the inclination of hot-house roofs. Elevations of roofs in 

 England. Figure representing different elevations. Figure showing the dif- 

 ference of latitude between London and Philadelphia. Application of these 



