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Frontispiece, i, cell of fleshy scale of bulb of onion (^Allium Cepa) showing cyto- 

 plasm, nucleus and large central vacuole. 



Chloroplasts : 2, a parenchyma cell of green fruit of garden pepper (Capsicum annum) 

 showing cytoplasm, nucleus and chloroplasts ; 2a, a chloroplast of a moss {Funaria) show- 

 ing^ green granules, assimilation starch grains and protein granules; 2b, a cell near the 

 periphery of the pseudo-bulb of the orchid (Phaius grandifolius) showing cytoplasm and 

 three reserve starch grains formed by leucoplasts, which latter under the influence of 

 light have developed into chloroplasts. 



Chromoplasts: 3, a parenchyma cell of ripe fruit of Capsicum annum showing cyto- 

 plasm, nucleus and yellowish-red chromoplasts; 3a, isolated chromoplasts of carrot 

 (Daucus Car Ota). 



4. transverse section of petal of wild pansy (Viola tricolor) showing colored cell-sap in 

 epidermal cells. 



