VI 
Contents . 
No. LXXXIII, July, 1907. 
PAGE 
Mother, David M. — The Development of the Heterotypic Chromosomes in Pollen Mother- 
cells. With Plates XXVII and XXVIII 3°9 
Fraser, H. C. I. — On the Sexuality and Development of the Ascocarp in Lachnea Stercorea, 
Pers. With Plates XXIX and XXX . 349 
Clark, A. M. — Secondary Thickening in Kendrickia Walked, Hook. f. With Plate XXXI . 361 
Hickling, George. — The Anatomy of Palaeostachya vera. With Plates XXXII and XXXIII, 
and four Figures in the Text ........... 369 
Bayliss, Jessie S. — On the Galvan otropism of Roots. With four Figures in the Text and 
two Curves . . . . . . . . 387 
Priestley, J. H., and Irving, Annie A. — The Structure of the Chloroplast considered in 
Relation to its Function. With two Figures in the Text 407 
Ridley, H. N. — Branching in Palms. With Plates XXXIV-XXXIX . . . . . 4 T 5 
Fritsch, F. E., and Rich, Florence. — Studies on the Occurrence and Reproduction of 
British Freshwater Algae in Nature. I. Preliminary Observations on Spirogyra. 
With eleven Figures in the Text 423 
NOTE. 
Scott, Daisy G.— On the Distribution of Chlorophyll in the Young Shoots of Woody Plants 437 
No. LXXXIV, October, 1907. 
Evans, I. B. Pole. — The Cereal Rusts. I. With Plates XL-XLIII 441 
Campbell, Douglas Houghton.— Studies on some Javanese Anthocerotaceae. I. With 
Plates XLIV-XLVI 467 
White, Jean. — The Influence of Pollination on the Respiratory Activity of the Gynaeceum . 487 
Reed, Howard Sprague. — The Value of Certain Nutritive Elements to the Plant Cell. With 
two Figures in the Text . .501 
Contents and Index v-viii 
Vines, S. H. — Biographical Sketch of Harry Marshall Ward (with Portrait) ix 
