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MANUAL OF BOTANY 



alkaloids, a.nd other complex bodies, are also to be met with 

 In many cells, though with a more restricted distribution, we 

 find dissolved various colouring matters, chiefly blues, violets, 

 or reds. 



The bodies which form the second or insoluble group include 



Fig. 64.^. 



Fig. 645. 



Fuj. G43. Cell of the Potato coiitaiuing starcli granules. Fhj. 0-14. West- 

 India Arrowroot ( x 250). Fig. 645. Sago meal ( x 250). 



starch grains, fats, proteid reserve materials, either in amorphous, 

 granular, or crystalline form, and crystals of inorganic salts. 



All these call for separate description. 



Starcli Griiins. — Starch is not only widely distributed through 



Fig. 646. 



Fig. 647. 



Fig. 648. 



Fifj. 646. Group of roil-like leucoplastids, Z, each bearing a starch-grain, s, 

 collected round the nucleus, n, of a cell of the pseudo-bulb of an Orchid 



(Plufjys grandi/olim). x SOO. After Schimper. Fig. 047. Tous les-mois 



( X 250). Fig. 648. Potato starch ( x 260). 



the different parts of a plant, but it also occurs in varying quan- 

 tity in all classes of plants with the exception of the Fungi. In 

 all cases starch is a transitory product stored up for future use. 

 "When required for the nutrition of the plant, it is converted 

 into sugar, which is a soluble substance, and can therefore be 



