776 



INDEX 



Oysters, enemies of, 563-564 

 factors of environment, 553 

 food of, 557-558 

 freezing of, 568-569 

 glycerophosphoric acid in, 573 

 glycogen in, 555 

 grading of, 567-568 

 green, 557-558 

 grit in, 574 

 growing of, 556-560 

 habitat of, 552, 556 



bottom, 556 



influence of trade wastes, 554-555 



salinity, 556 

 harvesting of, 561—563 

 hybrids from, 552 

 infection from eating, 571-572 

 "kitchen middens" of, 550 

 life history of, 552-554 

 mechanical harvesters for, 561-562 

 nutritional value of, 573-574 

 ostreasterol in, 573 

 propagation of, 555 

 public grounds of, 560-561 

 respiration of, 554-555 

 sanitary control of, 571-572 

 seasons for, 572 

 seeds of, 557, 561 

 shell motion of, 554 

 shellstock, brands of, 566-567 

 shucking of, 567 

 smoked, 417 

 spat collecting, 558-560 

 species of, 552 

 stigmasterol in, 573 

 tonging, 561 

 unloading, 565 

 washing, 565-567 

 world's production of, 550-551 

 yield of, 551, 556 

 Oyster shells, products from, 226 



"Pacific Explorer" factory ship, 353 



Packaging, 343-344 



Paint, fish oil in, 490 



"Pak Ice," 319 



Palmitalec acid, 706 



Panama, pearl fisheries of, 110-111 



Pantothenic acid, 486 



Paper, from eel grass, 103 



Paranzella net, 256-257 



Paste, anchovy, 462-463 



Pearl, beauty of, 107 



Pearl essence, 116-122 



aqueous suspensions, 117 



guanin in, 117 



nature of, 117 



nonaqueous suspensions and lacquer, 120 



preparation of, 117-118 



properties of, 117 

 purification of, 120 

 sources of, 117 

 uses of, 120-122 

 Pearl fisheries, in Australia, 110-111 

 in Ceylon, 107-109, 111 

 in Mexico, 109, 110 

 in Panama, 110-111 

 in Red Sea, 109, 111 

 in Venezuela, 109, 111 

 methods of. 111 

 native diving, 108-109 

 of Malaysia, 111 

 of Persian Gulf, 107, 108, 111 

 Pearl industry, 107-123 



shells, 124-125 

 Pearl oyster, fisheries, location, 108-110 

 Pearl shells, abalone, 128 

 chank, 110, 132 

 classification of, 132-133 

 composition of, 124-125 

 grading of, 133 

 green snails, 127 

 margaritifera, 107, 109-110, 125, 126 



black shells, 110, 127 



green shells, 109-110, 127 



white shells, 110, 126 



yellow shells, 126 

 species used, 125 

 structure of, 124-125 

 Trochus, 127-128 

 Pearls, black, 107, 111, 113 

 blister, 107, 138-139 



nature of, 107, 139 



origin of, 107, 138-139 



utilization of, 139 

 bouton, 139 

 brown, 107 

 characteristics of, 111 

 colors of, 107, 111 

 composition of, 107 

 culture of, 113, 115-116, 119 

 drilling of, 114 

 form of. 111 

 fresh water, 110, 112 

 growth of, 107 

 imitation alabaster, 121 



color, 122 



dipping of, 121-122 



indestructible, 117, 121 



manufacture of, 120-121 



threading, 122 

 mounting of, 114 

 oriental, 107-109, 112 

 origin of, 107 

 pink, 110-111 

 properties of, 107 

 rose-colored, 107, 108, 111 

 salve of, 8, 110-113 



