A STUDY OF PLASTIDS AND MITOCHONDRIA 
Nicolosi-Roncati, F. 19 12. Genesi dei cromatofori nelle Fucoidee. Bull. Soc. Bot. Ital. 
1912, pp. 144-149. 
Pfeffer, W. 1874. Die Oelkorper der Lebermoose. Flora 57: 2-6; 17-27; 33-43. 
Regaud, C. 191 1. Les mitochondries, organites du protoplasma consideres comme les 
agents de la fonction eclectique et pharmacopexique des cellules. Rev. Med. 31: 
Rivett, M. F. 19 1 8. The structure of the cytoplasm in the cells of Alicularia scalaris. 
Annals of Botany 32: 
Rudolph, K. 1912a. Das Chondriom der Pflanzenzelle. Sitzber. "Lotos" Prag 60: 
197-199. 
. 1912&. Chondriosomen und Chromatophoren. Ber. Deutsch. Bot. Ges. 30: 
605-629. 
Sapehin, A. A. 191 1. Uber das Verhalten der Plastiden im sporogenen Gewebe. Ber. 
Deutsch. Bot. Ges. 29: 491-496. 
. 1913a. Untersuchungen iiber die Individualitat der Plastide. Ber Deutsch. Bot. 
Ges. 31: 14-16. 
. 1913&. Ein Beweis der Individualitat der Plastide. Ber. Deutsch. Bot. Ges. 31: 
321-324. 
Schaudinn, F. 1903. Untersuchungen iiber die Fortpflanzung einiger Rhizopoden. 
Arb. Kaiserl. Gesund. 19: 
Scherrer, A. 1913. Die Chromatophoren und Chondriosomen von Anthoceros. Ber. 
Deutsch. Bot. Ges. 31: 493-500. 
Schmidt, E. W. 1912. Pflanzliche Mitochondrien. Progr. Rei Bot. 4: 163-181. 0 
Smirnow, A. E. v. 1907, Uber die Mitochondrien und den Golgischen Bildungen analoge 
Strukturen in einigen Zellen von Hyacinthus orientalis. Anat. Hefte 32: 143^-153. 
Tischler, G. 1906. Uber die Entwicklung des Pollens und der Tapetenzellen bei Ribes- 
Hybriden. Jahrb. Wiss. Bot. 42: 545-578. 
Van der Stricht, O. 1909. La structure de I'oeuf des r.Iammiferes. IIP partie. Mem. 
Acad. Sci. Belg. II. 2: 
Wakker, J. H. 1888. Studien iiber die Inhaltskorper der Pflanzenzelle. Jahrb. Wiss. 
Bot. 19: 423-496. 
EXPLANATION OF PLATES XXXIII-XXXIV 
All figures were drawn with the aid of the camera lucida, with a Leitz No. 3 ocular and 
Leitz 1/16 in. oil immersion lens, with the following exceptions: In figure 7 a Leitz No. 6 
objective was used; in figures 13 and 14, a Spencer 1/12 in. oil immersion lens. 
Plate XXXIII 
Fig. I. Cell from plerome of root-tip of corn, showing mitochondria. X 900. 
Fig. 2. Cell from periblem of same preparation, showing mitotic figure and ovoid 
and spherical mitochondria. X 900. 
Fig. 3. Cell from same region showing similar structares. X 1800. All of above 
from Regaud's fixation and haematoxylin stain. 
Fig. 4. Cell from plerome of corn root-tip, from plant grown under more favorable 
conditions. Benda's method of fixation and staining. Vesicular structures show light 
blue interior. X 900. 
Fig. 5. Two cells from periblem of same preparation. Mitochondria ovoid or spher- 
ical. X 900. 
Fig. 6. Series of plastids from same preparation, stained with Flemming's tri-color 
process. First six in series have red-staining granular inclusions; g, h, and i are stained 
blue. Iodine test shows starch grains in latter. (Fig. 6 on Plate XXXIV.) 
Fig. 7. Section from youn<g disc of Preissia, showing distribution of the granular 
material in the cells and in the thallus as a whole. X 385. 
Figs. 8, 9, and 10. Cells taken from same section, showing plastids, etc., on larger 
scale. X 900. 
