Index to Vo Is. I-X. 43 
Ophioglossaceae, Studies in the Morphology of the Spore-producing 
members, Part II (F. O. Bower), x. ioo. 
Ophioglossum, septation of sporangia, x. ioi. 
Ophrydium versatile, experiments on the effects produced by Hydrogen, 
x. 287. 
Orchid-disease, On an (G. MASSEE),ix. 170. 
Orchideae occurring in Lord Howe Island, x. 252. 
Orchids, On the Method of Fertilization of Bulbophyllum macranthum and 
allied (H. N. Ridley) (*), iv. 327. 
— — On the Velamen of (P. Groom), vii. 143. 
The ‘ Spot ’-Disease of (G. Massee) (*), ix. 421. 
Orchipeda Dregei, pollination (*), v. 362. 
Organogeny, Floral, and Anatomy of Brownea and Saraca (M. M. Hartog) 
(*), ii. 309. 
Origanum vulgare, insect-visitors, ix. 260. 
Ornithophilous Flowers in South Africa (G. F. Scott-Elliot) (*), 
iv. 265. 
Oscillariaceae, revised list of British marine, v. 67. 
Osmitopsis asteriscoides, pollination, v. 356. 
Osmunda cinnamomea, L., and O. claytoniana, L., Prothallium and 
Embryo of (D. H. Campbell) (*), vi. 49. 
antheridium (*), vi. 58 ; archegonium (*), vi. 65 ; embryo (*), 
vi. 72 ; fertilization, vi. 70 ; nuclear division (*), ix. 563 et seq. ; prothal- 
lium, growth of (*), vi. 53; spores, description (*), vi. 50; spores, 
germination of (*), vi. 51. 
claytoniana, L., and O. cinnamomea, L., The Prothallium and Embryo 
of (D. H. Campbell) (*) ; vi. 49. 
antheridium (*), vi. 58 ; archegonium (*), vi. 65 ; embryo (*), vi. 
72 ; fertilization (*), vi. 70 ; germination of the spores (*), vi. 51 ; pro- 
thallium, growth of (*), vi. 53 ; spores, description (*), vi. 50. 
regalis, leaf-apex (*), iii. 333 ; mucilage-secreting cells, structure of 
(*), i. 27, 41 ; nuclear division (*), ix. 563 et seq. ; root-apex (*), iii. 
310; sporangium, development (*), iii. 362 ; stem-apex (*), iii. 322. 
Osteospermum moniliferum, pollination, v. 358. 
Osterhout, W. J. V. — The Life-history of Rhabdonia tenera, J. Ag. 
(with Plates XX and XXI), x. 403. 
Osyridocarpos, staminal hairs, vi. 276. 
Othonna arborescens, pollination, v. 357. 
dentata, pollination, v. 357. 
Ovarian papilla in Loranthaceae, ii. 14 1 et seq. 
Overton, E. — On the Reduction of Chromosomes in the Nuclei of Plants, 
vii. 1 39. 
Oxalidaceae occurring in Lord Howe Island, x. 233. 
Oxalis fioribunda, experiments on the relation between calcium and the 
conduction of carbohydrates in, x. 94. 
Oxalis, pollination, v. 339. 
P. 
Pachymenia rugosa, sp. n., description, viii. 340. 
Pachytheca (Sir J. D. Hooker) (* +), iii. 135. 
Note on Mr. Barber’s paper on (W. T. T hiselton-Dyer) (t), v. 223. 
principal localities (t), v. 157. 
Structure of (C. A. Barber) (* +), iii. 141, v. 145. 
