EXPLANATION 01' THE PLATES. 501 



1 0. d, e, /, Chlorophyll-utricles in decaying cells of the 

 pro-embryo. They lie free in the cavity of the cells, and 

 have become abnormally altered before their complete 

 solution. They are globular, and the membrane may be 

 clearly distinguished from the fluid contents mingled with 

 minute granules, a. Contents still of a light green 

 colour. Diam. ='0035 of a line. b. Contents likewise 

 slightly green. Diam. =='005 of a line. c. Contents 

 colourless and transparent, with minute granules. Diam. 

 =008 of aline. 



11. Parietal chlorophyll-utricles which, from their 

 crowded position, form a parenchymatous layer. They 

 are filled with homogeneous chlorophyll, and inclose one 

 or two starch-granules, which have become blue from the 

 commencement of the action of aqueous solution of iodine. 



12. Chlorophyll-utricles from the parenchyma of young 

 leaves of Begonia dickotoma Jacq. In b h the starch is 

 coloured blue, from the commencing action of iodine. 



a. An utricle with homogeneous green contents. Diam. 

 = 003 of aline. 



b, c. Utricles with four and three minute starch- 

 granules. 



d, e, f. Utricles with a solitary larger starch-granule. 



y. An utricle with three larger starch-granules, paren- 

 chyrnatously connected through pressure. 



h. An utricle with two larger starch- granules flattened 

 by mutual pressure. 



i, k, I. Utricles with one large starch-granule, which 

 has now more or less displaced the chlorophyll. 



m. A starch-granule become free through the absorp- 

 tion of the chlorophyll-utricle. 



n. A group of three starch-granules, connected together 

 by adhesion, become free after the absorption of the 

 chlorophyll-utricle. 



13. Chlorophyll-utricles from a cell of Conferva ylome- 



