INDEX. 
Pituiary body, the, xii., 27 
Placer mining, viii.,149 , 
Placoderm fishes in Devonian of Ohio, 
V., 20 
Placoderms of the Devonian, iii., 54 
Plagioclase in granite diorite, xiv., 82 
Planariz, v., 48 
Planaria, ix., 33 
Planet Mars, drawings made of the 
markings on, xv., 64 
Planets, v., 247-253 
inferior, v., 247 
intra-Mercurial, y., 247 
major, v., 251 
Mercury, v., 248 
Venus, v., 248 
Mars, v., 249-250 
Asteroids, v., 250 
Jupiter, v., 251 
Uranus, v., 252, 253 
Neptune, v., 253 
Saturn, v., 251 
ultra-Neptunian, v., 253 
Planorbis levis, viii., 114 
Plantaginex, vii., 13 
Plantago Patagonica, vii., 13 
Virginica, vii., 13 
Plants, annual growth-rings in, iii., 
88 
fossil in Colorado, iii., 13, 77 
of Northern ‘Tertiary, present 
range, ili., 96 
Cretaceous, v., 133-137 ; vi., 16 
Triassic, vi., 125, 126 
distribution, xii., 189 
evolution, xiv., 49 
fossil, from Providence, R. I., iv., 
76 
from Worcester, Mass., iv., 75 
from Staten Island, v., 28, 29 
in siliceous soil, v., 217 
of Arizona, viii., 61-81 
Planting of Trees, iii., 35 
Plastic clays, new fossils from, vili., 
177, 178 
Platanus, iii., 47 ; xii., 33 
Aquehongensis, Xii., 32 
Newberriana, xiii., 181 
Platinum, v., 185, 187 
Experiments upon, xiv., 174 
Plattsburg, N. Y., singing beach at, 
lii., 73 
Pleistocene Lake bed at Elizabeth- 
town, N. Y., xiil., 107 
347 
Pleurosima, ix., 35 
Pliohippus, vii., 159, 160 
Plover, eggs of, xi., 24 
Pnigeacanthus deltoides, ix., 132 
Poa, viii., 79 
Podozamites, v., 136 
Pointing of building-stone, ii., 123 
Polariscope xv., 135 
Polarization of Light, Arago’s ex- 
planation, xiv., 158 
Historical Review, xiv., 156 
Qualitative experiments, xiv., 160 
Polar stars, catalogue of, xii., 186 
Polemoniacex, vii., 12 
Polemonium confertum, viii., 78 
Poliopstila albiventris, v., 55 
cerulea cesiogaster, x., 52 
Polorthus, ii., 85 
tibialis, 1i., 12 
Polygala alba, 1x., 183 
ambigua, ix., 9 
puberula, ix., 188 
verticillata, ix., 183 
verticillata ambigua, new, ix., 9 
ovalifolia, vii., 8 
Polygalex, vii., 8 
Polygonacex, vii., 13 
Polygonum Bistorta, vili., 79 
emersum, ix., 185 
Polynemidex, ix., 15 
Polyodon, xii., 122 
Polyporus abietinus, v., 111 
applanatus, v., 111, 113 
destructor, v., 110 
gilvus, v., 111 
hybridus, v., 110, 111 
lucidus, v., 110 
nidulans, v., 111 
pergamenus, v., 111 
pinicola, v., 111, 114 
salicinus, v., 111 
sulfureus, v., 111 
versicolor, v., 111, 113 
Ponds, artificial, viii., 117-125 
Populites, xii., 33 
Pop iluss Ne, Soe 1X pole XAT. Los 
angustifolia, Vi., 92 
monilifera, i1., 92 
apiculata, xii., 31 
Porcupine Mountains, Mich., geo- 
logical structure, ili., 14 
Porifera, v., 55 
Porliera angustifolia, ix., 181 
Porphyrite, ix., 143 
