Pliy^iology: (continuod) 



Salmon, nervous system 



Squoteaguo, ear 



Nervou3 system of Protozoa 

 Salmon 



Copopods, reaction Doc, 497, 824. 



vans sholl 

 Pieters, A. J. 

 Plgfish, life history 



Scale study, age determination 

 Pigott, Kadeleine G. 

 Pike perch, propagation Doc, 521, 1018. 



Sggs, mortality in 

 Pikes Doc, 853, 1018. 



Pilchards (fishery) of California 



Pilsbry, Henry A. Doc. 617, 739. 



Pirko, Franz von 

 Pittsburgh, Pa,, trade in fishery 



products, 1921 

 Plankton algae of Lake Erie 



Liraiological observations, Upper Miss- 

 River Doc. 958. 



Envircnuent of fishes, 



Connecticut Lakes Doc. 633. 



Production in fish ponds Doc, 1082. 



Investigation, methods Doc. 365. 



Of offshore v.aters of Gulf of Maine Doc, 968. 



Studios Doc. 221, 252, 365. 



Of YJoods Hole Doc, 975. 



In Great Lakes Doc, 252. 



Marine Doc, 971. 



Plants, aguatic, relation to 



substratum Doc, 566, 



In pond culture Doc, 643, 881, 948. 



Of viastem Lake Erie Doc. 479. 



Poikilotherriial vertebrates (cold blooded), 



digestive enzymes in fishes Doc. 977. 

 Pollock culture Doc, 522. 



Pollution; Doc. 619, 910; Bull. 22. 



Oil and tar pollution Doc, 910, 



Oil, effects on marine life Doc, 995. 



Narragansett Bay Doc, 569. 



Oysters Doc, 569. 



Upper Mississippi River survey Doc, 1023. 

 Pollution problems, 



Crude oil pollution, La, Bull, 18. 



Detection and measurement Bull, 22. 



Pulp mill pollution, oysters Bull. 6. 

 Polychaetous annelids, Hawaiian la. Doc. 601. 



Porto Rico Doc. 464. 



Pond culture Doc, 30, 67, 103, 111, 304, 346, 347, 



643, 687, 815, 820, 1056, 1085. 



Dragonflios and damselflies in 



relation to Doc, 882, 



Fishes, propagation of Doc. 1056; E.G. 41. (see fish culture.) 



182 



