(Edema of the Tomato. 119 



To be certain that the anatomical characters of the cushions 

 developed artificially comported with th-'se developed under the pre- 

 vailing conditions in the forcing house, portions of the stems of the 

 No. 18 an i Lorillard varieties used in the experiment, on which the 

 cushions appeared, were hardened, sectioned and prepared for study by 

 the same method used in the preparation of the former material. The 

 plants having been kept under the moist cage so long, their surfaces 

 were very wet and the superficial portions of the cushions were broken 

 down. 



Plate VII represents four sections from the preparations. The two 

 upper figures, 13 and 14, are from the stem of the No. 18 variety, 

 while the two lower figures, 15 and 16, are from the stem of a Lorril- 

 lard. Each one of the figures includes the same depth structurally of 

 the stem, the portion represented including the epidermis, layer of 

 chlorophyll bearing cells, the collenchyraa and cortical parenchyma. 

 In each of the varieties the left hand figure in the Plate shows the 

 anatomical structure of the cushion, while the right hand figure shows 

 that of the opposite side of the stem where the tissue possesses its 

 normal form, the drawing both of the left and right hand figui-es being 

 made from the same section. In both varieties the epidermis, the layer 

 of chlorophyll bearing cells, and two layers of the cells of the collen- 

 chyma participate in the radial elongation. The remainder of the 



Zimmerman, Zur kritik per Bohm-Hartigschen Theorie der Wasserbewegung 

 in der Pflanze, Ber. d. Deutsch, Bot. Gessellsch, Bd. i, p. 183. Ueber die 

 Jamin'ische Kette, Ibid. p. 384. 



Westermaier, Zur Kenntniss der osmotischen Leistungen des lebenden 

 Parenchym's. Bar. d, Deut. Bot. Gessellsch. Bd. i, 1883, p. 371. 



Elfving, Ueber den Transpirationsstrom in den Pflanzen, Acta Societatis 

 Scientiarum Fenuicae, T, xiv, 1884, cited by Ward, 1. c. 



Scheit, Die Wasserbewegung im Holze, Bot. Zeit, 1884, p. 177. 



Godlewski, Zur Theorie der Wasserbewegung in den Pflanzen, Pringsheims 

 ^ Jahrb f iir wissensch. Bot. Bd. xv. Heft 4, 1884, p. 569. 



Kohl, Zur Wasserleitungsfrage, Bot. Zeit, 1885, p. 522. 



Errera, Eun Transpiration Versuch. Ber. d. Deut. Bot. Gessellsch., 1886, 

 p. 16. 



Zimmerman, Zur Godlewskischen Theorie der Wasserbeweg'ung in der 

 Pflanzen Ber. d. Deut. Gessellsch, 1885, p, 290. 



Hensen, Ein Beitrag zur Kenntniss des Transpirationsttromes, Arb. d. Bot. 

 Inst. Wiirzburg, 1885, p. 805. 



Scheit, Die Wasserbewegung im Holze. Jenaische Zeitschrift fur Naturk, 

 1885. Cited by Ward, 1. c. 



Schwendener, Untersuchungen iiber das Saftsteigen, Sitzungsb. d.k. preuss. 

 Akad. Wies, 1886. See Ward. 



