INDEX. 



Spectrum, CO 2 haemoglobin, 76 



Fraunhofer lines of, 75 



haematin, 77 



haematoporphyrin, 77 



haemoglobin, reduced, 76 



methsemoglobin, 76 



oxy-haemoglobin, 75 



sodium, 75 



solar, 75 



Sphygmomanometer, 119 

 Spinal cord as a reflex centre, 48 

 hemisection of, 52 

 diffusion of impulses in, 48 

 Spirogyra, 2, 3 



Spirometer, calibration of, 151 

 Stannius' experiment, 95 

 Starch, digestion of, 125 



formation of, in plant cell, 3, 4 

 Stimulation, latent period of, 23 

 Stimuli, chemical, electrical, mechan- 

 ical, 22, 23 



summation of, 28 



Stimulus and sensation, relation be- 

 tween, 172 



Stomach, vagus nerve in, 129 

 Strychnine, influence on reflexes, 49 

 Sugars, test for, 125 

 Summation of contractions, 29 



of stimuli, 28 

 Sunlight, effect on organisms, 2 



effect on plant metabolism, 4, 5 

 Supplemental air, 152 

 Suprarenal glands, 144 



extract of, 145 



effect on blood pressure, 145 

 effect on heart-beat, 92 

 effect on muscle twitch, 45 



removal of, in rabbit, 144 

 Suspension method of recording 



heart-beat, 84 

 Swallowing, mechanism of, 127 



relation of vagus nerve to, 128 



Sylvester, method of artificial respira- 

 tion, 162 



Sympathetic nerve, cervical, section 

 of, 115 



Tactile sense, 173 

 Talqvist, hoemoglobinometer of, 68 

 Tarsal cartilages, eye, 178 

 Telephone, detection of action cur- 

 rent with, 23 



Temperature, influence of, on heart- 

 beat, 83, 85, 118 

 on muscle twitch, 26 

 on plant growth, 4 

 on tetanus, 30 

 sense, 176 



Tenon, capsule of, 178 

 Tensile strength of muscle, 21 

 Tension, influence of, on muscle 



twitch, 33 



Tetanus, effect of fatigue on, 30 

 effect of temperature on, 30 

 genesis of, 29 

 incomplete, 30 

 Thermal stimuli of muscle and nerve, 



2 3 



Thigh, frog's, dissection of, 18 

 Thoma-Zeiss haemocytometer, 59 

 Thrombin, 58 

 Thyroid feeding, 142 



removal, 142 

 Tidal air, 152 

 Tone, muscle, artificial, 37 



natural, 38 

 Torula, 4 

 Touch-spots, 174 

 Trypanosoma, 6, 7 

 Tuning-fork interrupter, 18 

 Twitch, muscle, effect of fatigue on, 

 26 



effect of temperature on, 26 



form of, 23 



