Index 



233 



Selection, genetic, 56, 57, 59, 66, 



68, 69, 76 

 Shrinkage, in solutions, 52, 147- 

 154 

 of nuclei, 179 

 Similitude, 12 

 Sister individuals, similarity of 



sizes of, 44, 64 

 Size, and species, 49 



limits to, 13, 95 

 Specific gravity, 11, 12, 50-52 

 Specific surface, 164 

 Spine size, 188 

 Spore formation, 29, 31, 54 

 Starvation, 56, 63, 87, 123, 132- 

 135, 183-186 

 and growth, 36 

 Sugars, 52, 130-131, 153 

 Surface, cell, 158-170, 202 

 formation of, 97, 101 

 specific, 164 

 Surface-mass ratio, 12-13, 158- 



170 

 Surface tension, 167 



Temperature, 55, 56, 74, 122-128, 

 181, 199 



and fission, 83 



and growth rate, 29, 31, 40-41 

 Toxicity, 53 

 Turn-over rates, 6-11, 164 



Urea, 149, 163 



Vacuoles, contractile, 8-11, 163, 

 188 



food, 8 

 Variability, of duration of life, 

 89-90 



of multiplication rates, 73-75 



of size, 42-153, 109, 139 



causes of, 61, 64, 189 

 Viscosity, 167-169 

 Volume, cell, see Size, Growth 



Water, content of, 6-7, 37 

 turn-over of, 8-11 



Zygotes. 62 



