JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XIX, 



Illustrating Dr. Schimper's Paper on the '' Develop- 

 ment of Starch-grains/' 



In all cases the magnifying power is 850 diameters. The chlorophyll- 

 corpuscles are more darkly shaded than the leucophyll-corpuscles or the 

 starch-forming-corpuscles. 



Figs. 1 — 3. — Prom the stem (pith) of Vanilla planifoUa. 



Fig. 1. — Young flattened chlorophyll-corpuscles, containing but 

 little starch, collected round the nucleus. 



Fig. 2. — A more advanced stage : the chlorophyll-corpuscles are 

 now spherical, and contain numerous starch-grains. 



Fig. 3. — Mature starch-grains : the chlorophyll-corpuscles have 

 nearly or entirely disappeared. 

 Figs. 4, 5.— From the cortical parenchyma of the stem of Philodendro7i 

 grandifolium. 



Fig. 4. — Young flattened chlorophyll-corpuscles with small starch- 

 grains attached to their surfaces ; seen on the surface and in profile. 



Fig. 5. — From an older cell. The originally free starch-grains have 

 become adherent, forming compound grains ; the chlorophyll-cor- 

 puscles are represented by a small gelatinous residue. 



Figs. 6 — 8. — From the pith of the stem of Peperomia stenocarpa. 



Fig. 6. — Young chlorophyll-corpuscles of a flattened form, with 

 small starch-grains projectiug from the surface ; seen on the surface 

 and in profile. 



Fig. 7. — h. more advanced stage. Most of the starch-grains have 

 now a distinct hilum. 



Fig. 8. — Large starch-grains from an older cell; «, with a gela- 

 tinous chlorophyll-corpuscle attached to the posterior end ; b, a 

 starch-grain, with two chlorophyll-corpuscles, in consequence of which 

 it has grown especially in two directions. 



Figs. 9, 10. — From the pith of the stem of Oxalis Ortgiesii. 



Fig. 9. — From a young cell. A simple flattened chlorophyll-cor- 

 puscle, and others in process of division, with small starch-grains 

 projecting from the surface. Seen from above. 



Fig. 10. — A large starch-grain, with a chlorophyll-corpuscle attached 

 to it posteriorly. 

 Figs. 11, 12. — From the pith of Begonia cucullata. 



Fig. 11. — Surface view of young lenticular chlorophyll-corpuscles, 

 with starch-grains. 



Fig. 12. — Older starch-grains, with chlorophyll-corpuscles attached 

 to their posterior ends. 

 Fig. 13. — From the cortical parenchyma of the stem of Biejfenhachia 

 Segiiina. 



Fig. 13. — Each of the three starch-grains has been formed by two 

 chlorophyll-corpuscles, and its growth has therefore proceeded in two 

 directions. In a and b there is only a small portion of the chlorophyll- 

 corpuscle remaining, in c it has entirely disappeared. The other 



