214 Rivett.—The Cytoplasm in the Cells of Alicularia scalaris , 
There is no evidence from my observations to show that the chondriosomes 
are either transformed directly into plastids by a secretion within their own 
substance, as has been observed in other plant cells, or that they are the 
instigators of secretory action on the part of the protoplasm. Nor do my 
observations suggest that the refractive moving bodies of the living proto¬ 
plasm are themselves chondriosomes, for their appearance in the stained 
mature cells is quite different from that of the chondriome in the actively 
dividing cells. This investigation merely supports the view that the cyto¬ 
plasm of the actively dividing cells has a chondriome structure and is not 
a spongy network, though the vacuolar appearance of the older cells might 
quite well be given that name. 
Finally, I wish to express my thanks to Professor j. B. Farmer, F.R.S., 
both for the suggestion of this research and for the assistance which he has 
rendered. 
Bibliography. 
1 . Pfeffer : Uber Olkorper der Lebermoose. Flora, 1874. 
2 . Wakker : Studien liber die Inhaltskorper der Pflanzenzelle. Pringsh. Jahrb., 1888. 
3 . Zimmermann : Botan. Microtechnik, 1892. Beihefte Bot. Centralbl., 1894. 
4 . Raciborski : Anzeig. Akad. Krakau, 1893. 
5 . VON Kuster : Die Olkorper der Lebermoose. Basel, 1894. 
6. Garjeanne : Die Olkorper der Jungermanniales. Flora, 1903. 
7 . Czapek : Biochemie der Pflanzen, 1913. 
8. E. W. Schmidt : Pflanzliche Mitochondrien. Progressus rei botanicae, 1913. 
9 . Guilliermond : Bemerkungen liber die Mitochondrien. Berichte der Deutsch. Bot. Gesellsch., 
1914- 
10 . Lewitzky : Die Chondriosomen als Sekretbildner. Berichte der Deutsch. Bot. Gesellsch., 1912. 
8, 9 , 10 . See summary by F. Cavers in the New Phytologist, 1914-1915. 
EXPLANATION OF PLATE VI: 
Illustrating Miss Rivett’s paper on the Structure of the Cytoplasm in the Cells of Alicularia 
scalaris , Cord. 
Figs. 1, 2, 3, 4. Very young leaves mounted in water and viewed from the surface, showing 
early formation of oil-drops. 
1. Apex of second leaf: three cells without oil-drops, one cell with oihdrops. 
2. Margin of third leaf near base. 
3. Margin of third leaf nearer apex. 
4. Apex of third leaf. 
Figs. 5, 6, 7. Cells from longitudinal sections through the growing point. 
5 a. Apical cell of first and third, 5 b, of fourth leaf stained with triple stain. 
6. Apical cells showing chondriome structure, stained with iron-haematoxylon. 
7. Cells from fourth leaf showing vacuoles and young chloroplasts. 
