FRONTISPIECE. I, cell of fleshy scale of bulb of onion (Allium Cepd) showing cyto- 

 plasm, nucleus and large central vacuole. 



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

 showing cytoplasm, nucleus and chloroplasts; 2a, a chloroplast of a moss (Funaria) showing 

 green granules, assimilation starch grains and protein granules; ab, a cell near the periphery 

 of the pseudo-bulb of the orchid (Phaitis 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 annuum showing cyto- 

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

 Carota). 



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

 epidermal cells. 



