INDEX 



235 



Phosphates, excretion of, 144 

 Phosphorus food, 58 



- test for, 181 

 Photo-assimilation, 54 

 Photo-chemical reactions, 113, 116 

 Physical properties and chemical con- 

 stitution, 35 



Physiology, i, 7 

 Pigment of eye, 116 

 Pilocarpine, 82 

 Pitch of notes, 107 

 Placenta, 154 

 Plasma, 135, 136 

 Plasma-membrane, 9, 15 

 Plasmolysis, 20, 171 

 Platelets, 223 

 Poison gases, 86 

 Polari meter, 49, 181 

 Polarised light, 49, 113 

 Pole-finding paper, 177 

 Pollen grains, 153 

 Pollen-tube, 227 

 Polypeptides, 47 

 Position in space, 104 



- receptors, 117 

 Posture phenomena, 99 

 Potassium as radio-active element, 60 



- function of, 142 

 Potential energy, 1 1 

 Practical value of science, 2 

 Precipitation by electrolytes, 178 



- of colloids by electrolytes, 35 

 Proprio-ceptors, 119 



- and tonus, 100 

 Proteins, 47, 75 



- of the plasma, 141 

 Protoplasm, 2, 7 



- chemical composition of, 41 

 Protoplasmic movements, 166 

 Protozoa, 56 

 Pseudopodia, 3, 7, 9 

 Psychology, i 



Pupil of eye, 115 

 Putrefaction, 56 

 Pyrrol, 55 

 Pyruvic aldehyde, 76 



QUALITY in sensation, 106 

 of musical notes, 108, 1 1 1 



RADIANT energy, 1 1 



Radio activity of potassium, 142 



Rate of conduction of nerve impulse, 

 130 



- reaction between colloids, 179 

 Rates of chemical reactions, 67 



- of reactions, 189 

 Reabsorption in kidney, 139 

 Receptors, 103 

 Recessive, 156 



Reciprocal innervation, 125, 146 

 Red beet root, experiments with, 168 

 Red corpuscles, 85 



destruction of, 135 



formation of, 135 



Red marrow, 135 

 Reduction, 92 



- by milk, 203 



Reflex action, 80, 103, 120, 124, 209, 

 216 



- arc, I2i 



Refractory phase of nerve, 130 



- period, 98, 208 

 Regulation of blood supply, 145 



of heart beat, 148 



- of reaction of blood, 143 



- of temperature, 101 

 Rejuvenescence, 152 



Removal of products of reactions, 72 

 Reproduction, 151 

 Resistance of blood corpuscles, 175 

 Resonance, 52, no 



- of membrane, 212 

 Respiration, 84 

 Respiratory quotient, 95 

 Restitution phase in muscle, 101 

 Re-suspension of colloids, 36 

 Reticular membrane, no 

 Retina, 114, 116 



- structure of, 214 

 Ringer's solution, 224 



Ring form of amino-acids, 47 

 Rods of retina, 116 

 Roman farming, 58 

 Root nodules, 58, 187 



- pressure, 82 

 "Rust" in wheat, 157 



SALIVA, 66 



- and thirst, 84 



Salivary glands, nerves to, Si 



reflex, 128 

 Salts in food, 59 



of the blood, 142, 223 



- required for growth, 60 

 Saponin, 15 



