IV 
Index of Subjects 
PAGE 
Laboratory Notes: 
(1) See Bench Light . . . . -231 
(2) See Multiple Switch . . . . .166 
(3) See Projection Microscope . . . .163 
(4) See Respiroscope . . . . 230 
Lichens, by Annie Lorrain Smith [Review]—W. Watson . 102 
Multiple Switch and Commutator for Thermocouples, A (Labora¬ 
tory Note) (1 Text-fig.)—H. J. Denham . . . 166 
Mycologists, Notices to— 
(1) The Lister Institute National Collection of Type Cultures 232 
(2) Continuation of Saccardo’s Sylloge Fungorum . . 232 
Osmotic Pressure, see Permeability 
Periodicity of Freshwater Algae in Nature, A Study of some of the 
Factors controlling the—(concluded) (2 Text-figs.)—W. J. Blod¬ 
getts ....... 15 
Permeability—Walter Stiles 
VI. Osmotic Pressure . . . . 1 
VII. The Cell Wall . . . . .49 
VIII. The Plasma-Membrane . . . .140 
IX. The Water Relations of the Plant Cell . .169 
X. The Influence of External Conditions on the Intake 
and Excretion of Water by Plant Cells and Tissues 233 
Phrenology, Studies in, No. 3 (1921) (with Tables)—Sir Francis 
Darwin . . . . . . .34 
Plasma-Membrane, The, see Permeability 
Primula elatior x vulgaris, The origin of the hybrid, demon¬ 
strated experimentally in the field, with notes on other British 
Primula hybrids—Miller Christy .... 293 
Primula vulgaris, see Primula elatior 
Projection Microscope, The (Laboratory Note)—H. J. Denham . 163 
Protoplasmic Streaming, A method for inducing—William Seifriz 107 
Respiroscope, A Simple (Laboratory Note)—Sydney J. Mangham 230 
Root Pressure, Further Observations upon the Mechanism of— 
J. H. Priestley . . . . . . 41 
Second or Autumnal Flowerings of Plants, Records of—Sir 
Francis Darwin and A. Shrubbs . . . .48 
Sylloge Fungorum, Continuation of Saccardo’s—(Notices to Myco¬ 
logists) ....... 232 
