Index 



871 



Estradiol, 745 



structure of, 743 

 Estriol, 745 

 Estrogens, 745 

 Estrone, 745 

 Euglena, flagella in, 642 

 growth in amino acids, 116 

 photoreceptor in, 383, 384, 385 

 Euryhaline, definition, 20 

 Excretion, chloride, in crayfish, 31 

 fluid, in Amoeba, 41 

 in Paramecium, 43 

 ionic, 92 

 nitrogen, 187-208 



distribution of products, 190-200 

 protein, conclusions on, 201 

 salts, in marine fish, 48 

 sodium chloride, in Carcinus, 26 

 Exhalation, 254 

 Exopeptidases, 159 

 characteristics of, 166 

 distribution of, 165 

 Expiration, 254 

 Eye, adaptation in, 397-405 



to arrhythmic activity, 397 

 to day-time activity, 397 

 to media and substrate, 402 

 to night-time activity, 398 

 to photic quality, 404 

 to space and motion, 398 

 appositional, 388, 390 

 color in Drosophila, 729 

 color changes and, 685 

 compound, in arthropods, 387 



structure of, 387 

 in molluscs, 384 

 in vertebrates, 393-405 

 morphology of, 393 

 retina in, 395 

 movements, 401 



pigment of, hormonal control of, 763 

 in compound eye, diurnal movements 

 of, 388 

 superpositional, 388, 390. See also 

 Photoreceptors. 

 Eyeshine, 398 

 Eyestalk, color changes and, 694 



effect on molting in crustaceans, 738 

 retinal pigment hormone in, 764 



Facilitation, delayed, 801 



early, 801 



neuromuscular, 594 



synaptic, 800 

 Fasciola hepatica, osmoregulation in, 18 

 Fat, as dietary essential, 133 



digestion of, 176-178 



metabolism in grasshopper, hormones 

 and, 759 



Fat, oxygen consumption in utilization of, 

 237 



synthesis from carbohydrate, 269 

 Fatty acids in diet, 133 

 Feathers in temperature regulation, 367 

 Feces, region of formation, 149 

 Feeding and digestion, 144-186 



cilia in, 641 



habits, correlation with digestive en- 

 zymes, 178 



mechanisms, 144-147 

 Female hormones. See Estrogens. 

 Female reproductive cycle, endocrine in- 

 fluences on, 749 

 Fibers, nerve. See Nerve fibers. 

 Fibrinogen, serum, molecular size, 105 

 Field, visual, 399 

 Firefly, 664 



control of flashing in, 672 

 Fish, acclimatization in, 348 



ammonotelic, 197 



anadromous, 49 



blood pressure in, 537 



carbon dioxide content of blood in, 330 



catadromous, 49 



chemoreception in, 456 



chromatophores in, 685, 686, 706 



color changes in, 715 



conditioned responses in, 845 



distribution of in relation to respiratory 

 pigments, 315 



eftc>-,. ^L ,.nyiuia hormone on, 759 



electric, 617 



erythrocytes in, 296 



forebrain in, 835 



fresh-water, osmoregulation in, 47 



gas bladder in, 218 



gills in, 216 



heart in, 544 



hemoglobin content in, 296, 315 



hormones and growth in, 729 



kidney in, 48 



luminescence in, 665 



marine, osmoregulation in, 48 



nitrogen excretion in, 194, 197 



osmoregulation in, 46-52 

 in eggs of, 19 



oxygen consumption of, 239 



oxygen dissociation curves of, 315 



oxygen tension in relation to pH in, 249 



oxygen withdrawal by, 252 



phonoreception in, 484-488 



photosensitive pigments in, 412 



respiratory characteristics of blood, 308 



respiratory control in, 257 



responses to hydrostatic pressure, 509 



spinal reflexes in, 824 



temperature receptors in, 350 



ureotelic, 197 



