188 
Populus tremula, 61, 76, 81, 150. 
Postglacial period, length of the, 25. 
Potamogeton crispus, 156, 157. 
densus, 157. 
—__-—_ filiformis, 158. 
heterophyllus, 155. 
lucens, 1 56. 
natans, 155, 
——__———  obtusifolius, 157. 
—— st — peclinaius, 158, 
perfoliatus, 156. 
—_-——  prelongus, 156. 
pusillus, 157. 
——-——  rufescens, 155. 
trichoides, 100, 157, 158. 
——_ Zizi, 155. 
Potentilla Comarum, 117 
Tormentilla, 116, 117. 
Poterium officinale, 117, 118. 
Potonié, H., 153. 
Prairies, plants of, 15, 21, 22. 
Preglacial flora, 1, 2, 35, 36, 39, 50-52, 
58, 62, 63, 64, 74, 82, 83, 84-86, 88, 
89, 93, 99, 171-179. 
Prestwich, Sir J., 71, 88, 145. 
Privet, 28, 
Provinces, botanical, ro. 
Prunella vulgaris, 136. 
Prunus Avium, 114. 
domestica, 114. 
Padus, 114, 
Spinosa, 113. 
Prussia, 52, 68, 75, 81. 
Pteris aquilina, 168, 
Pyrenean plants in Britain, 2-5, 14, 15, 
17, 18, 24-27, 40, 22, 
Pyrus Aria, 85, 119. 
Aucuparia, 61, 119. 
communis, 65, 119, 
—— Malus, 28. 
torminalis, 75, 78, 118, 
Quercus Robur, 23, 26, 28-30, 46, 100, 
145, 146. 
Rabbit, bones of, 66, 
Races and subspecies, 4, 5, 102. 
Rainfall, 10, 11, 14. 
Lndex. 
Ranunculus acris, 103. 
——————- aguatilis, 4, 26, to. 
——_——- bulbosus, 104. 
Ficaria, 105. 
Fi la, 4, 103. 
hederaceus, 102, 
Lingua, 103. 
parviflorus, 105. 
repens, 104. 
Sardous, 104. 
sceleratus, 102. 
Red Crag, 35. 
Redhall, near Edinburgh, 53, 60, 86, 87, 
II1. 
Reeds, 57, 80, 167. 
Reid, Miss M. A., 66. 
Reindeer, 20, 81, 93, 94. 
Renfrewshire, 63, 70, 86, 98, 106, 132. 
Rhamnus Frangula, 112. 
Rhine, old course of the, 35, 97. 
Rhinoceros, 54, 55, 81, 94. 
Rhododendron, 12. 
Ridley, H. N., 146. 
Ripening of seeds, period of, x, 4. 
Robertson, D., 59, 70. 
Rock Doves, acorns carried by, 30. 
Romans, plants introduced by the, 16, 
51, 89, 103, 112. 
Roman Period, 51, 52, 89, 93, 96, 171- 
179. 
Rooks carrying acorns, 29, 30. 
Rosa, 118. 
Rubus cesius, 116. 
Sruticosus, 26, 115, 116. 
Id@us, 59, 115. 
saxatilis, 116. 
Rumex Acetosella, 141. 
conglomeratus, 139, 140. 
crispus, 140, 141. 
—— Aydrolapathum, 141. 
maritimus, 140. 
obtustfolius, 140. 
Ruppia maritima, 158. 
Ruscus aculeatus, 11, 12. 
Rushes, 22, 26, 66, 69, 87. 
Russia, 163, 166. 
Sagittaria sagittifolia, 154. 
Saint Cross, Suffolk, go. 
Salisbury, Arctic mammals of, 21, 42, 45. 
