326 



INDEX OF SUBJECTS 



PhyUodoce, heliotropism of, 146 



and light, 248 

 Physical conditions and plankton, 

 308 



and metabolism, 239 

 Pipe-fish, 93 

 Placenta, 82 

 Plaice, 84 



density in North Sea, 171 



development, 84 



length and weight, 174 



marking experiments, 198 

 Plankton, 56, 65 



algae of, 98 



amphipods of, 70 . 



appendicularians of, 67 



ascidians of, 67 



calendar of, 94 



Ceratium, 75 



chemical analysis of, 129, 131 



chemical composition of, 189 



ciliata of, 75 



cirripedes of, 69 



coelenterates of, 73 



collection by pumping, 138 



convection changes, 148 



copepods of, 70, 99 



Crustacea of, 69 



ctenophores, 74 



decapods of, 70 



dilution methods, 132 



distribution of, 142 



diurnal variations, 146 



echiuoderms of, 73, 97 



estimation of, 129 

 by enumeration, 133 

 by mass, 131 

 by volume, 129 

 by chemical analysis, 131 



feeders, 222 



filtering apparatus, 125 



filtration, loss of, 136 



fish eggs in, 95, 97 



fishes of, 66 



flagellates of, 75 



food-stuff, as, 210 



food value of, 211 



foraminifera of, 75 



Halospliaera, 98 



heliotropism of, 145 



heteropods of, 72 



infusoria of, 75 



isopods of, 70 



Lakes of Illinois, in, 135 



larvae of, 166 



loss due to preservation, 136 



maximum catch of, at Kiel, 210 

 medusae of, 98 

 mollusca of, 72 

 paper-filters for, 136 

 pasture, compared with, 192 



Plankton (cont.) 



peridinians of, 75 



pteropods of, 72 



radiolaria of, 75 



schizopods of, 70 



siphonophores of, 74 



Squilla in, 98 



statistics of, in North Sea, 309 



stratification of, 145 



succession of, 96 



test hauls of, 143 



Tintinnoidea, 75 



variation with latitude, 155 



worms of, 72 

 Plankton Expedition, 135, 143, 204, 



242, 257, 258 

 Plankton-types, 150 



distribution of, 152 

 Plants 



characters of, 225 



food-stuffs of, 234 



insectivorous, 234 



metabolism of, 224 



motility in, 225 

 Plasma of blood, salts of, 301 

 PleurobracJiia, 74 

 Polvzoa, reproduction of, 88 

 " Poseidon," 214, 218 

 Potassium, elimination from sea, 300 



in blood, 801 

 Prawning, 108 

 Producers, 207 



and consumers, 166 

 Production 



absolute, of sea, 187 



by plants, 286 



in sea, 235 



in sea areas, 187 

 Productivity 



Baltic, of, 194 



beef on land, 193 



carp ponds, 184, 193 



cockle beds, 193 



Conway mussel fisheries, 182, 194 



cultivated land, 193, 194 

 mussel fisheries, 185 



European fisheries, 181 



German carp fisheries, 184, 193 



inshore fisheries, 181 



Lancashire cockle fisheries, 183 



Morecambe Bay, 182, 194 



mussel beds, 193 



North Sea fisheries, 180, 194 



North-Western fisheries, 181 



shell-fisheries, 182 

 Proteids. composition of, 208 



as food-stufif, 208 



decomposition of, 261, 262 



Egyptian mummy, in, 276 



metabolism of, 275 



putrefaction of, 261 



