286 Hill.-— The Histology of the Sieve-Tubes of A ngio sperms. 
Gardiner, W. : The mode of formation of the initial cell-wall, &c. Proc. Camb. Phil. Soc., 
vol. xiv, 1907, p. 209. 
Haberlandt: Physiologische Pflanzenanatomie. 
Hill, A. W. : Phil. Trans. Roy. Soc., 1901, ser. B, vol. cxciv, pp. 83-125, Pis. XXXI-XXXV. 
- 1 Ann. Bot., vol. xv, 1901. 
Notes on the Histology of the Sieve-tubes of certain Angiosperms. Ann. Bot., 
vol. xvii, 1903, p. 265. 
The Histology of the Sieve- tubes of Angiosperms. Brit. Ass. Rep. Southport, 1903. 
Janczewski : Etudes comparees sur les tubes cribreux. Ann. des Sc. Nat., Bot., ser. vi, t. xiv, 1882. 
Kienitz Gerloff : Ber. d. deutsch. bot. Ges.,xx, 1902, p. 108 (mentions the sieve-tubes of Gaged). 
Koernicke : Ber. d. deutsch. bot. Ges., xxi, 1903, pp. 96 et seq. (A summary of recent papers on 
protoplasmic continuity, &c.) 
Kuhla : Die Plasmaverbindungen bei Viscum album (Sieve-tubes of Viscum and Cucurbita). Bot. 
Zeit., 1900, pp. 38 et seq. 
Lecomte : Contribution a l’^tude du liber des Angiospermes. Ann. des Sc. Nat., Bot., ser. vii, 
t. x, 1889. 
Leger : Mem. Soc. Linn. Normandie, vol. xix, 1898. 
Mangin : Bull. Soc. Bot. Fr., 1892, p. 260. (Callus.) 
Meyer : Bot. Zeit., 1902, pp. 102-106. (A critical review of Strasburger’s Paper in Jahrb. f. 
wiss. Bot., 1901.) 
Perrot : Le Tissu cribl^, Paris, 1899. 
Pfeffer : Plant Physiology, Eng. Trans., pp. 580 et seq. 
Russow : Sitzb. d. Dorpat. Nat. Ges., 1882, p. 264. Ueber den Bau und die Entwickelung der 
Siebrohren. (Trans, into French, Ann. des Sc. Nat., Bot., ser. vi, c. xiv, 1882, p. 173.) 
Sitzb. d. Dorpat. Nat. Ges., 1883, p. 570. 
Scott: In Ann. Bot., vol. iv, 1889, p. 156 (in which the suggestion of the secretory nature of 
the companion-cells is made). 
Strasburger : Leitungsbahnen, 1891. 
Ueber Plasmaverbindungen pflanzlicher Zellen. Jahrb. f. wiss. Bot., 1901, 
pp. 526 et seq. 
Bot. Zeit., 1902, p. 50. (A critical review of the paper, by the author, on the 
sieve-tubes of Pinus, in Ann. Bot., xv.) 
Kleines Bot. Pract., Vierte AufL, pp. 84 and 85. (The figures of Pinus sieve-tubes 
are said by Strasburger in Bot. Zeit., 1902, to have been altered in accordance with the views 
put forward in the author’s paper on Pinus ; they are still, however, somewhat obscure.) 
Wilhelm : Beitrage zur Kenntniss des Siebrohrenapparates dicotyler Pflanzen. Leipzig, 1880. 
EXPLANATION OF FIGURES IN PLATES XVII 
AND XVIII. 
Illustrating Mr. A. W. Hill’s paper on the Sieve-tubes of Angiosperms. 
The lenses used were Swift’s ^ and T \ apoc., Zeiss’ ^ apoc., with 6, 8, and 1 2 compensating oculars. 
The following lettering is used in the figures: c= callus; /= protoplasm ; m = median 
node ; cl — cellulose ; bp = bast parenchyma cell ; st = sieve- tube ; cc = companion cell ; r = radial ; 
t = tangential wall. 
PLATE XVII (Figs. 1-17). 
Wistaria chinensis. 
Fig. 1 . A young sieve-plate showing the deep pits lined by callus in the form of paired basins, 
x 1,000. 
Fig. 2. A slightly older plate with pit fillings. The papillae, retracted from the holes in the 
callus, are seen on the lower edge of the pit fillings, x 1,000. (Cf. Text-fig. 7, p. 27). 
