450 APPENDIX. 



lishments which export palms, azaleas, rhododendrons, 

 and laurels all over the world, including Italy and the 

 Argentine. 



R. CULTURE UNDER GLASS IN HOLLAND. 



Holland in its turn has introduced gardening in 

 hothouses on a great scale. Here is a letter which I 

 received in the summer of 1909 from a friend : 



" Here is a picture-postcard which J. (a professor 

 of botany in Belgium) has brought from Holland, and 

 which he asks me to send you. [The postcard repre- 

 sents an immense space covered with frames and 

 glass lights.] Similar establishments cover many 

 square kilometres between Rotterdam and the sea, 

 in the north of Heuve. At the time when J. was 

 there (June 10) they had cucumbers, quite ripe, and 

 melons as big as a head in considerable numbers, 

 exported abroad. The cultures are made to a great 

 extent without heating. The gardeners sow also 

 radishes, carrots, lettuce, under the same glass. The 

 different produce comes one after the other. They also 

 cultivate large quantities of strawberries in frames. 



" The glass-frames are transported at will, so as to 

 keep under glass for several days or weeks the plants 

 sown in any part of the garden. J. is full of admira- 

 tion for the knowledge of the gardeners. Instead of 

 the usual routine, they apply the last progress of 

 science. He was told that glass is broken very seldom ; 

 they have acquired the art of handling glass-frames 

 with facility and great skill. 



" Besides the frames represented on the photograph, 

 the region between Rotterdam and the sea, which 

 is named Westland, has also countless glass-houses, 



