132 The Horticulturist" s Rule-Book. 



Per Cent, of Rays of Light Reflected from Glass Roofs at 

 Various Angles of Divergence from the Perpendicular. 



(Bouguer. ) 



1° 2.5 per cent. 



10° 2.5 



20° 2.5 



30° 2.7 



40° 3.4 



50° 5.7 



60° 11.2 



70° . . 22.2 



80° 41.2 



85° .... 54.3 



Area of Glass in Various States and Provinces, used for 

 Commercial Greenhouse Purposes. 



(Stewart.) 



Glass in use 

 previous 

 to 1887. 



Alabama 50,000 



Arkansas 14,474 



California 213,660 



Connecticut 



Delaware 79,100 



District of Columbia . . 125,000 



Florida 20,000 



Georgia 33,100 



Illinois 1,422,533 



Indiana 142,866 



Iowa 125,580 



Kansas . 31,600 



Kentucky 320,400 . . . 



Louisiana 24,420 11.400 



Maine 102,033 19,130 



Maryland 185,526 29,908 



Massachusetts 1,375,000 53,000 



Minnesota 138,500 22,600 



New Hampshire ...... 86,450 11,825 



New Jersey 2,114,245 297,529 



, IIS 



For cut- 



CREASE IN 



For 



e88 7 , 



Total 



flowers. 



plants. 



increase. 



3,000 



6,780 



9,780 



8,188 



4,150 



12,338 



59,810 



32,200 



92,010 



35.071 



17,551 



52,622 





3,000 



3,000 



37.100 



4,000 



41,000 



20,000 



10.000 



30,000 



2,400 



500 



2,900 



12,676 



36,824 



99,500 



20,575 



23,240 



43,815 



27,900 



13,110 



41,010 



1,800 



2,250 



4,060 



7,600 

 4.000 



5,600 

 3,275 

 59.504 



19,000 

 23,130 

 29,908 

 53,000 

 28,200 

 15,100 

 357,033 



