LIST OF ILLUSTRATIONS 



PAGE 



Conservatories, New York Botanical Gardens 



Frontispiece 



1 Hotbed in operation 10 



2 Standard -hotbed sash 12 



3 Double-glass sash 15 



4 Plari for permanent hotbed . . . .19 



5 Permanent hotbed of concrete with cast-iron sills 19 



6 Plan for temporary hotbed . . . . .20 



7 Type of hotbed used when a large amount of 



heat is required . . . . . .20 



8 Usual type of concrete hotbed . . .21 



9 Hotbed arranged for heating by flues . . 23 



10 A good type of coldframe . . . . .24 



11 Coldframe with sash removed . . . .25 



12 A cold or storage-pit . . . . . .26 



13 Sash-bed attached to basement of dwelling . 28 



14 Types of forcing boxes or plant forcers . . 29 



15 Forcing boxes in use on a commercial scale . 29 



16 Gable-roof sash-bed heated by manure . . 30 



17 Rye straw mats rolled for storage . . .31 



18 Hotbed covered with mat and shutter . .32 



19 Private range of C. E. Chapman, Oakdale, N. J. . 37 



20 Ground plan of range shown in Fig. 19 .38 



21 Commercial range of Hoerber Bros., DesPlaines, 



111 ... 39 



22 Ground plan of range shown in Fig. 21 . . 40 



23 Part of vegetable forcing range of Searls Bros., 



Toledo, Ohio . . . ... .41 



24 Diagram showing method of measuring pitch of 



roof .42 



25 Commercial range of C. H. Metcalfe, Milford, 



^Mass " . .43 



26 Diagram showing how heat and light rays are 



lost by reflection . . . ~ .".. . . .44 

 26a Diagram showing pitch of roof necessary to pre- 

 sent an angle of 90 degrees to the sun's rays 

 in winter . 45 



27 An uneven span greenhouse . . . .53 



28 Uneven span, side-hill vegetable house . . 55 



xiii 



