SUBJECT INDEX 



305 



Respiratory accelerator hormones, 



168ff., 169, 254, 255 

 Respiratory inhibitor hormones, 



178ff., 254 

 Respiratory quotient, 180 

 Responses, graded, 154 

 Retina, 24 



Retinal cells, contractile fibres in, 

 71,19, 80,81 

 distal, 71, 74, 77ff., 78, 80ff., 81, 



108 

 proximal, 77, 79 

 Retinal-dark, and -light-adapting 



hormones, 80ff., 81 

 Retinal-pigment-concentrating and 

 -dispersing hormones, RPCH 

 and RPDH, 78, 79ff., 108, 156 

 Retinula cells, 74, 81 

 Retrocerebral system of insects, 33 

 Rhabdome, 81 



Rhythm, diurnal, in Ca metabolism, 

 242 

 . diurnal, in pigment cells, 80ff., 



85, 86, 93, 99, 103, 259 

 of nocturnal activity, 69 

 of muscle contractions, face 62, 



63 

 of secretion, 116, 144 

 tidal, 85, 259 

 Ring-gland, of Diptera, 135, 195 

 Ringer's solution, 59, face 62, 63, 



213, 233 

 Rodentia {see Cavia and Rattus) 



Saccus vasculosus, 41 

 Saline, hypertonic, 228, 239 



injections, 14, 37, 148, 212, 224 



medium, 218, 232, 233 {see also 

 Ringer's solution) 

 Salinity, changing, 215, 227 



excessive, 212, 218 

 Salivary glands, of Cephalopoda, 

 22, 38ff., 73, 116,205,230 



of Mammalia, 117, 216 



Salt, NaCl, concentration in blood, 

 143, 206, 208, 209ff., 225ff. 

 excretion of, 13, 213, 214, 218, 



218fn., 220, 258 

 injection of, 14, 92, 175, 191 , 224 

 in medium, 224, 232 

 reabsorption of, 206, 211, 212, 



214, 218, 235 

 uptake, 210, 211 {see also Electro- 

 lyte balance and Ions) 

 Seawater, 92, 212, 218, 226, 236 

 hypertonic, 37, 207, 236 

 hypotonic, 237 

 migration from, 206, 212 

 Secretagogues, 5, 117, 119, 124 

 Secretin, action of, 1, 8, 118, 119, 

 120, 120, 122fr., 127 

 control of secretion of, 57, 123, 



123, 156, 253 

 source of, 45, 46, 56, 64, 123ff. 

 Secretion, 



by nerves {see Neurosecretion) 



inhibition of, 117, 126ff. 



of acid, 118, 119ff., 120, 122, 127, 



153,253 

 of bicarbonate, 120, 122ff., 123, 



253 

 of enzymes, 115, 116, 117, 118, 



124ff., 125, 127 

 of hormones, q.v. 

 phases of, 20, face 22, between 

 22 and 23, 32, 52 

 Secretory cells {see Endocrine and 

 Exocrine secretory cells) 

 giant, 32 

 Sensitivity, threshold of, 154 



specific variation in, 235 

 Sex-differentiation, 



in pigmentation of Uca, 99 

 in secondary characters, 149, 

 150, 151 

 Sinus gland, 



as storage organ, 22, 24, 25ff., 26, 



27, 33, 35 

 equivalent organ in Ligia, 102 



