146 
aN 
Nairry, lvi 
Naiadacee, xliv 
Nardus stricta, 91 
Narthecium ossifragum, 
Nasturtium officinale, 5, 
100 
palustris, 5 
Natural Hist. Soc. Strom- 
ness, xlviil 
Natural Hist. Soc. Edin., 
xlvi 
Natural Science, xliv 
Natural selection, xvii 
Neill, Patrick, xxx, xxxi, 
xlv 
Neckeracex, 120 
Neckera, 120 
Nepeta hederacea, 54, 102 
Newark, Deerness, xxix 
Nitella opaca, 97 
North Ronaldshay, xviii 
Nymphacee, lvi 
O 
OBSERVATIONS IN OrK- 
NEY, lvii 
Old Red Sandstone, I xviii 
Oligotrichum, 115 
Ophioglossum vulgatum, 
95 
ambiguum, 95 
Oreadian botany, 1 
Oreadian Old Red, Ixix 
Orchis incarnata, 75 
anguatifolia, 75 
erecitorum, 75 
latifolia, 75 
maculata, 75 
mascula, 7+ 
Orkney and Caithness 
united, Ixxxi 
Orkney and Shetland 
united, Ixxxvii 
Orthotrichacewx, 117 
Orthotrichum, 118 
Oxalis acetosella, xxxvili, 
16 
Oxyria reniformis, 62 
Oyce, Firth, Ixi 
— 
PAPAVER DUBIUM, 4 
Rheas, 4 
Parnassia palustris, 25, 
137 
Peach, Dr, lxxxvi 
Peat bogs, lviii, lix 
Peat deposits, Ixxxviii 
Pedicularis palustris, 53 
sylvatica, 53 
Penant, Mr, xxxvii 

INDEX. 
Pentland Firth, 
Ixxxvili 
Perthshire, xv 
Peplis portula, 22 
Petasites vulgaris, 38 
Phalaris arundinacea, 85 
Phleum pratense, 85 
Philonotos, 118 
Phragmites communis, 
86 
Phyllitis scolopendrium, 
9 
Ixxxvi, 
Physical features, Ixxviii 
Pimpinella saxifraga, 28 
Pin-eyed, Ixvii 
Pinguicula lusitanica, 58 
vulgaris, 58 
Pinus sylvestris, xe, xcii 
Plagiothecium, 122 
Plants, distribution of, 
XCV 
Plant evolution, x 
Plants found in peat, 
Ixxxix 
Plantago coronopus, 60 
hirsuta, 59, 60 
lanceolata, 60 
linearis, 60 
major, 59, 103 
maritima, 59, xili 
minor, 59 
Plateaux of Mainland, 
lxxxii 
Pleuridium, 113 
Poa annua, 89 
compressa, 89 
pratensis, 89 
trivialis, 89 
Poa fluitans, xlvii 
Pollexfen, Dr, xlviii 
Polygala depressa, 9 
oxyptera, 9 
vulgaris, 9 
Polypodium vulgare, 92, 
after 
Polystichum aculeatum, 
lobatum, 94 
lonchitis, 94, 136 
Polygonum agrestinum, 
amphibium, lxv, 63 
“quaticum, 63 
avieculare, 63 
Bistorta, 64 
conyolvulus, 63 
lapathifolium, 63 
litorale, 63 
microspermum, 63 
Persiciria, 63 
terrestre, 62 
viviparum, xxix, 64 
vulgatum, 63 
Polytrichum, 113 
Populus tremula, 66 
Porotrichum, 121 
Potamogeton, 
Berchtoldi, 71 
cordato-lanceolatus, 134. 
crispus, 72 
filiformis, 72, 73 
Friesii, 72 
heterophyllus, 70, 73 
lancifolius, 71 
lucens, 72 
natans, 70 
nitens, 71, 73 
pectinatus, 72 
perfoliatus, 71, 134 
polygonifolius, 71 
praelongus, 71 
pusillus, xxi, 71, 73 
rigidus, 73 
rufescens, 73 
rutilus, 73 
salicifolius, 71 
lerrestre, 71 
Potentilla anserina, 20 
incisa, 20 
silvestris, 20, 103 
Poterium Sanguisorba, 20 
Pottia, 116 
Pre-glacial stream, 
Ixxxviii 
Primula, new, 138 
Primula scotica, xviii, 
xxix, lii, 47, 48, 132, 140 
elator, xlvili 
farinosa, 138 
intermedia, 47 
stricta, 139 
veris, 47 
vulgaris, 47 
Prunella vulgaris, 54 
Psamma arenarea, lix 
Pteris aquilina, 92 
Pterygophyllum, 12) 
Ptychostomum, 119 
Ptychomitrum, 116 
Pyrola rotundifolia, xxiv, 
46, 131 
Pyrus aucuparia, 22 
Ee 
RACKWICK, xxvi, Xxvii 
Radiola linoides, 14 
Rainfall, mean, xv, xvi 
Rainy days, lvii 
Raised sea beaches, Ixiii 
Ranunculus acris, 3 
Baudotii, 2, 128 
bulbosus, 3 
divergens, 3 
Drouetii, 2 
Ficaria, 3, 100 
fiammula, 3 
Godronii, 2 
hederaceus, 2 
heterophyllus, 2 
poeudo reptans, 3 
repens, 3 
