236 



INDEX 



Saponin, action of, on enzymes, 70 



- bubble, 1 68 

 Sarcoplasm, 96 



and tonus, 100 



Sciatic nerve, position of, 199 



Scurvy, 61 



Sea anemone, nervous system of, 123 



water, 60 



Second law of energetics, 12 

 Secondary sexual characters, 155 

 Secretin, 82, 137 

 Secretion, 78, Si 



- disappearance of granules in, 196 

 Segregation of gametes, 157 

 Semi-circular canals, 118 



- of skate, 214 



Semi-permeable membranes, 19 

 Sense-organs, 103 

 Serum, 142 

 Sex, 152 

 Shivering, 101 

 Shock after wounds, 147 

 Silver chloride, action of light on, 116 

 Sine curve, 1 12 

 Size, perception of, 119 

 Skin receptors, 106, 210 

 Small intestine, 71 

 Smell, 104, 107 



Smooth muscle, properties of, 79 

 Soap bubbles, 167 



- film, 6, 10 



solution, 167 



Sodium bicarbonate in blood, 143 

 Solids, permeability to, 10 

 Solution of gases, 86 

 Sound, 104, 107 

 Sources of carbon, 41 

 Specialised receptors, 107 

 Specific sense energies, 105 

 Spectroscope, 52 

 Speech and writing, 120 

 Spermatozoa, 153, 226 

 Spinal cord, 120 



- frog, 103, 124, 209, 216 

 Splanchnic nerve, 80 

 Sponges, 122 



Spores, 56, 151 



Spring for muscle model, 204 



Staining, 179 



- of histological preparations, 37 

 " Staircase," 98, 207 



Stannius' ligature, 207 

 Starch, 53 



formation of, 186 

 Statocyst of Cyclas, 214 



Statocysts, 117 

 Stearin, 65 

 Sterilisation, 57 

 Stimulus, 94 

 Stomach, 71 



- of frog, contractions of, 196 

 Storage of fat, 74 



Strength of acids, 175 



- of acids and bases, 26 

 Structure of muscle, 96 

 Struggle for existence, 13, 56, 159 

 Sugar, test for, 169 



Sugars, 41 

 Sulphur food, 58 



- test for, 181 

 Supra-renals, 131, 136 

 Surface action by enzymes, 192 



- energy, 14 



- tension, 6, 8, 9, 167 



- and dispersion, 177 



- in muscle, 96 



- of colloids, 32 

 Suspensoids, 30 

 Sweat glands, 84 

 Sweating, 101 



Swelling of colloids by acid, 97 

 of gelatin, 177 

 Symbiosis, 58 

 Sympathetic system, 131, 146 



- of frog, 215 

 Synapse, 121, 122 

 Synaptic system, 123 



Synthesis and hydrolysis by catalysts 



68 

 by enzymes, 191 



TASTE, 104, 107 

 Taste-buds, 211 

 Tectorial membrane, 1 10 

 Teeth, use of, 66 

 Telephone exchange, 127 

 Temperature, effect of, on muscle, 

 206, 225 



- regulation, 101 

 Temporary association, 127, 128 

 Tension of active muscle, 94 



- of gas, 85 

 Testis, 153 



Tetanic contraction, 98 

 Tetanus of muscle, 206 

 Thermodynamics, 10 

 Thirst, 84 

 Thoracic duct, 140 

 Thought and memory, 124 



