PLATE 36.— Starch. 



Figure 



1 . Section of a cell of the albumen of a young maize seed, showing the nascent 



starch-grains imbedded in protoplasm. 



2. The same, somewhat older ; most of the starch-grains exhibit a central point or 



"hilum." 



3. Section of a cell from the outer horny part of the albumen of maize ; the starch- 



grains completely fill the cell, and by their crowded condition have compressed 

 each other into polygonal form. 



4. Part of a similar section treated with iodine. «, starch-grain cut across (with a 



central cavity) ; 5, intervening protoplasm. 



5. Free starch-grains of maize from the cells of the centre of the seed. 



6. Young starch-grains of ditto. 



7. Compound starch-grains and separated granules, from the corm of the crocus. 



8. Lenticular starch-grains of wheat. «, seen in face; 5, seen edgewise. 



9. Biscuit-shaped starch-grains of barley, a a, front view; b, edgewise. 



10. Compound starch-grains and separated granules of oats. 



1 1 . Compound grains and separatedgranules of Portland arrowroot (Arum maculatum) . 



12. Part of a section of a cell of the grain of rice, exhibiting very minute starch- 



grains, firmly compacted as in maize. 



13. A portion of the same, more magnified. 



14. Starch-grains of Cassava {Jatropha Manihoty^ , 



15. Young starch-grains from the cells of the 'prothallium of a fern {Gymnogrammd) . 



16. Compound starch-grains and separated granules of the bread-fruit (^Artocarpus 



incisa)'^. 



17. Starch-grains of Cycas circinalis^'. 



18. Starch-grains of the arrowroot {JMaranta arundinacea)^ from Singapore*. 



19. Starch-grains of an East Indian arrow root obtained from a species of Curcuma"^. 



20. Cell of a potato, showing the loosely-packed starch-grains. 



21. Isolated starch-grains of the potato. 



22. Starch-grains of Tacca pinnatijida, from Tahiti*. 



23. Starch-grains of sago (from a Sagusl)^. 



24. Starch from plantain-meal {Musa). «, front view; b, edgewise*. 



25. Starch of Tous-les-mois (Cannd). «, front view; ^, edgewise*. 



26. Section of a cell of the cotyledon of a haricot-bean. «, starch-grains ; 5, the 



pitted secondary layers of amyloid upon the cell- wall. 



27. An isolated starch-grain from the same. 



28. Part of a cell of the stem of the white lily (Lilimn candidum)^ showing nascent 



starch-grains. «, forming in cavities of the protoplasm c ; 4 nucleus. 



* The figures to which this asterisk is appended, were taken from specimens with which we were 

 favoured from the Museum of Economic Botany at Kew. 



