Origin of Species, J. D. Hooker's essay, 320
Ovule, R. Brown on, 117-119, 184-185
---- Griffith on, 185-188
---- Schleiden and, 185
Oxford, Professorship at, 16, 17
---- Gardens of, 16, 17, 27
Parasites, education of, 277
---- host of, 268
Parasitic habit, adoption of, 269
Parasitism, adaptive, 277
Permanence of species, Lindley and, 173
Philosophical Biology, J. D. Hooker and, 315-323
Philosophical Transactions, Ward and, 264, 266-267, 269, 270, 275
Phlogiston theory, 66, 79
Photosynthesis, 80
Plant diseases, Ward on, 268
Plant histology, early work in, 199
Plant nutrition, 69, 72
Plant pathology, 4, 231-232
Plant physiology, Agriculture and, 7
---- ---- Chemistry and, 7
---- ---- experimental, 68, 83
---- ---- founders of, 2, 6, 68
---- ---- Gilbert and, 234-235
---- ---- Grew on, 58, 60, 61
---- ---- Hales and, 71-78, 80-83
---- ---- Hope and, 287, 289
---- tissues, Grew on, 54
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