THE CANE 



ir 



times of the 5^ear, varying in the different cane-growing regions, and if the cane 

 is not sufficiently mature at the flowering time in its first year, no formation 

 of flowers occurs until the second year. In this way a delay of a few weeks 

 in planting will retard flowering for 

 twelve months. 



The pollen grains magnified 360 

 times are shown in Fig. 13, after Will- 

 brink and Ledeboer^ ; a is a ripe pollen 

 grain, shown also germinating a.t b ; c 

 and d are j'oung unripe pollen grains ; 

 k is the germ pore ; the exine is shown 

 at e and the intine at i. The pollen 

 grains are small yellow, nearly spheri- 

 cal bodies ; the outer wall, the exine, 

 is of cork tissue and has an opening, 

 k, the germ pore. The inner wall, the 

 intine, is of pure cellulose and has no 

 opening. When ripe the interior of the pollen grains are filled with starch' 

 and are opaque, but when unripe the interior is bright and transparent. 



Fig. 13 



REFERENCES EN CHAPTER I 



*' The Sugar Industry in the United Provinces of Agra and Oude." 



H.S.P.A. Ex. Sta., Path. Ser., Bull, 2. 



Van Deventer's " De Cultuur van het Suikerriet op Java." 



Java Arch., 1896, 4, 525. 



Java Arch., 1904, 12, 772 ; 1905, 13, 306. 



Agric. News, 1914, 13, 231. 



Stubbs' " Sugar Cane." 



Newlands' " Sugar." 



Van Deventer's " De Cultuur van het Suikerriet op Java," p. 62. 



