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Page 
Oxygen. See Gas Mixtures. 
Papaver dubium, P.rhceas and the hybrid between them— 
0• h■ Salmon ... ... ... ... ... ... Ill 
Perianth. See Ranunculus. 
Phaenological Study, A—Sir Francis Darwin ... ... 287 
Plagiochasina appendiculatuin L. et L. and P. articulatum 
Kashyap, The androecium in—S. R. Kashyap .. 235 
Plasmolysis, On the Relation of, to the shrinkage of 
Plant Tissues in Salt Solutions—Walter Stiles 
and Ingvar Jorgensen ... ... ... ... 40 
Potato Blight, An account of some Field observations on 
the Development of—F. T. Brooks ... ... ... 187 
Potatoes, Sprouting of, in various Gas mixtures—Franklin 
Kidd ... ... . . ... 248 
Potato, Wart Disease in the. See Synchytrium. 
Ranunculus auricomus and Anemone coronaria, Observa¬ 
tions on the Perianth in—W. B. Turrill ... ... 253 
Sargant, Ethel—A. A(rber) ... ... ... ... ... 120 
Sea, Ionic Phase of the—A. H. Church . . ... ... 239 
Seeds, The Influence of Temperature on the Soaking of— 
Franklin Kidd and Cyril West ... ... ... 35 
Shrinkage of Plant Tissues in Salt Solutions, On the 
Relation of Plasmolysis to the—Walter Stiles and 
Ingvar Jorgensen ... ... ... ... ... 40 
Synchytrium endobioticum (Schilb) Percival, The Cause of 
Potato Wart Disease—K. M. Curtis ... ... 90 
Teaching, The Reconstruction of Elementary Botanical 
50, 56, 58, 108 
Trachelomonas inconstans, A new Flagellate—Nellie 
C at tei ... ... ... ... ... ... ... 118 
Vitality, On the Retention of—by Algae from old Stored 
Soils—B. Muriel Bristol 
Wart Disease in Potato. See Synchytrium. 
92 
