INDEX OF AUTHORS 
PAGE 
Armstead, Dorothy, see Priestley 
Christy, Miller. The origin of the hybrid Primula elatior x 
vulgaris demonstrated experimentally in the field, with notes 
on other British Primula hybrids .... 293 
Crow, W. B. A critical study of certain unicellular Cyanophyceae 
from the point of view of their evolution (1 Text-fig., 2 Tables) 81 
Darwin, Sir Francis. Studies in Phaenology, No. 3 (1921) . 34 
Darwin, Sir Francis and Shrubbs, A. Records of Autumnal or 
Second Flowerings of Plants . . . .48 
Denham, H. J. A multiple switch and commutator for thermo¬ 
couples (Laboratory Note) (1 Text-fig.) . . .166 
- The projection microscope (Laboratory Note) (1 Text-fig.) 163 
Hodgetts, William J. A study of some of the factors controlling 
the periodicity of freshwater algae in nature {concluded) 
(2 Text-figs.) . . . . . -15 
Mangham, Sydney J. A simple respiroscope (Laboratory Note) 230 
-A cheap bench light (Laboratory Note) . . *231 
North, Edith E., see Priestley 
Priestley, J. H. Further observations upon the mechanism of 
root pressure . . . . . • 4 1 
- Physiological studies in plant anatomy. I. Introduction . 58 
Priestley, J. H. and Armstead, Dorothy. The physiological rela¬ 
tion of the surrounding tissue to the xylem and its contents 
(Physiol, studies in plant anatomy, II) (3 Tables) . 62 
Priestley, J. H. and North, Edith E. The structure of the endo- 
dermis in relation to its function (Physiol, studies in plant 
anatomy, III) (5 Text-figs.) . . . .113 
Priestley, J. H. and Tupper-Carey, R. M. The water relations of 
the plant growing point (Physiol, studies in plant anatomy, 
IV) (2 Text-figs.).210 
Priestley, J. H. and Woffenden, Lettice M. Causal factors in 
cork formation (Physiol, studies in plant anatomy, V) . 252 
