SUBJECT INDEX. 



4or> 



Clover, variation in blossoms of, 

 29; five-leaved, origin of, 62; 

 five-leaved, effect of soil on, 

 284 



Coat colour, inheritance of, 133 

 Cockle, effect of salinity on, 



DTK 

 I O 



Coefficient of Regression, 127, 

 128, 132; relation of, to corre- 

 lation, 128 



Coefficient of variation, 26; is 

 this a correct measure of varia- 

 bility? 27 



Cold, effect of, on Lepidoptera, 

 233 



Collateral inheritance, 125, 135; 

 relation of, to lineal, 128 



Colour of skin, changes in, pro- 

 duced by light, 251, 256, 257 



Colouration, of flounder, effect 

 of light on, 251; of pupae, 259; 

 of caterpillars, 260 



Columba lima, reversion to char- 

 acters of, 140, 141 



Composite, variation in, 47 



Conception, condition of mother 

 at time of, as regards offspring, 

 209 



Conditions of life, may produce 

 local races, 311; effect of, on 

 Lepidoptera, 316; cumulative 

 action of, in maize, 352; in 

 cress, 353; in ducks, 353; in 

 sheep, 354; in dogs, 355; in 

 butterfly, 356 



Correlated variation, in Sciurus 

 carolinensis, 6; in Linaria 

 spuria, 10 



Correlation, determination of, 74; 

 improved method, 84; capri- 

 ciousness of, 86 ; between ances- 

 tors, 125; relation of, to regres- 

 sion, 128; in man, 75, 83, 150, 

 347, 348; in shrimps, 79; in 

 crabs, 80, 81; in prawn, 82; in 

 Vegetable Kingdom, 135; in 

 daphnia, 178; in aphis, 180; in 

 Ficaria, 185; relation of, to va- 

 riability, 210; homotypic, 211 



Correlation constant, 74 



Correlation, negative, 73, 79 



Correlation values, diagram of, 

 78 



Corrosive sublimate, acclimatisa- 

 tion to, 381 



Cowslip, hybrids of, 164 



Crabs, measurements of, 13, 14; 

 natural selection in, 337 



Critical period of reaction, in 

 Lepidoptera, 240 



Crops, growth of, affected by 

 manures, 282 



Crosses, between Echinoderms, 

 110; fertility of, 165; among 

 Lepidoptera, 172 



Crossing of type and varietal 

 forms, 92 



Crowfoot, effect of nutrition on, 

 284 



Crustacea, effect of light on, 253, 

 254; effect of salinity on; 271, 

 275 



Cultivation, effect of, on spider- 

 wort, 313 



Cumulative action of conditions 

 of life, in maize, 352; in cress, 

 353; in ducks, 353; in sheep, 

 354; in dogs, 355; in butterfly, 

 356; in general, 394 



Cumulative action of products 

 of metabolism, 308 



Curve of Error, normal, 18; 

 values of, compared with act- 

 ual measurements, 22 



Curves of plant variation, 43, 44, 

 45, 49, 50 



Curves, symmetrical and asym- 

 metrical, represented by gen- 

 eralized expression, 32 



Cypris reptana, parthenogenesis 

 in, 177 



D 



Daffodil, crosses of, 163 



Daphnia magna, measurements 

 upon, 178; reaction of, to en- 

 vironment, 179; effect of prod- 

 ucts of metabolism on, 308 



Darkness, effect of, on plant 

 growth, 245; on molluscs, 252; 

 on Crustacea, 253; on fish, 254 



