Oxenden, Mr. G. C, obligations to, 25; on Epipactis purpurata, 102
Parfitt, Mr., on attached pollinia, 31
Parker, Mr. R., obligations to, 129
Pedicel of pollinium, 253; elasticity of, 283
Percy, Dr., analysis of labellum of Warrea, 270
Peristylus viridis, secretion of nectar, 43, 63; rostellum, 255
Petals, uses of, 274
Phaius, 146
——grandifolius, 280
Phalanopsis, viscidity of stigma, 153; movement of pollinia, 159; labellum, 276
——amabilis, 159
——grandiflora, 159; projection of labellum, 269
Platanthera, 75
——chlorantha, 69
——dilatata, 77
——flava, 76, 77
——hookeri, 75
——hyperborea, 76; self-fertile, 291
Pleurothallis ligulata, 135
——prolifera, 135
Pogonia ophioglossoides, 86
Pollen-masses, rudimentary in Monochanthus, 201; gradation of, 257, 288
Pollen-tubes emitted from anther, 258
Pollinia, movements of, in Orchis mascula, 12–15; in O. pyramidalis, 21; of the Vandeæ, 154; of Catasetum, ejection of, 184; attachment to rostellum, 251; gradation, 257; movements, 271
Pterostylis, nectary of, 232
——longiflora, 87, 89
——trullifolia, 86, 88; imperfect fertilisation in New Zealand, 280
Rodgers, Mr., obligations to, 129; on Myanthus and Monochanthus, 196; secretion of nectar in Orchids, 265; in Vanilla, 266
Rodriguezia secunda, 159
——suaveolens, movement of pollinia, 156, 159
Rohrbach, Dr., on Epipogium gmelini, 103
Rostellum, a single organ in the Ophreæ, 45; of the Vandeæ, 150; aborted, 242; gradation of, 247; of Apostasia, 248; diversity of structure, 250; crest of, in the Ophreæ, 255; in Catasetum, 256
Scott, Mr., on flowers of Acropera, 168, 172; of Gongora, 169; nectar-receptacle, 269; number of seeds in capsule of Acropera, 278; prepotency of pollen, 289
Scudder, Mr., on Pogonia ophioglossoides, 86
Secretion of nectar, 36, 229, 265
Seeds, production and number of, 276, 277
Selenipedium palmifolium, 232
Self-fertilisation, summary on, 293
Sepals, uses of, 274
Serapias cordigera, 27
Sexes of Orchids, 196
Smith, Sir James, on position of flowers in Malaxis, 129
——, Mr. G. E., on bees visiting the Bee Ophrys, 55
