SUBJECT INDEX. 



409 



Laws of Chance, dependence of 

 variability upon, 11 



Laws of Variation, 189 



Leaf surface, action of light on, 

 248 



Lemming, effect of cold on, 243 



Lepidoptera, crosses among, 167; 

 sports among, 171, 172, 175; 

 effect of temperature on size 

 of, 230; reversion in, 234, 239; 

 seasonal dimorphism in, 233, 

 239, 241, 242; seasonal adapta- 

 tion in, 234; seasonal forms of , 

 produced by temperature, 236; 

 variable protective resemblance 

 in, 258; effect of moisture on, 

 268; effect of food on, 288 



Leuciscus balteatus, distribution 

 of fin rays in, 42; variation in, 

 324 



Life, expectation of, 347 



Light, effect of, on plants, 245; 

 on tadpoles, 249; on snails, 

 249; on pigmentation, 249; on 

 Proteus, 251 ; on flounder, 251 ; 

 on molluscs, 252; on Crustacea, 

 253; on fish, 254; on frog, 255 



Limncea, effect of products of 

 metabolism on, 302, 303, 307 



Linaria spuria, variation in, 15 



Linaria vulgaris, origin of muta- 

 tion in, 61 



Local race of mice, 350 



Local races, the result of environ- 

 ment, 310; in trees, 311; in 

 Alpine plants, 311 ; in shrimps, 

 318; in mackerel, 319; in 

 herring, 322; in fish, 324; in 

 birds, 325; in mammals, 327; 

 in rabbit, 330 



Longevity, 347; and fertility, 348 



Lowland plants, compared with 

 highland, 311 



M 



Mackerel, local races in, 319 

 Maize, cumulative action of con- 

 ditions of life on , 352 

 Malformations, artificial produc- 

 tion of, 173 



Man, rate of growth of embry- 

 onic, 201; variability of, 205; 

 permanent effect of environ- 

 ment on growth of, 208; effect 

 of light on skin of, 250 



Manures, effect of, on growth of 

 crops, 282 



Mare, Lord Morton's, 175 



Maritime plants, 269 



Maturity of sex-cells, variation 

 in, 110, 112 



Maximum temperature, of plant 

 growth, 228 



Mean Squares, method of, 25 



Measurements, deviations of, 

 accord with Law of Error, 12 



Mechanical strains, adaptation 

 to, 375 



Median, defined, 17 



Mediocrity, regression towards, 

 126, 129; of children, compared 

 with parents, 129 



Melanism in Mollusca, 232 



Mendel's Law of Hybridisation, 

 155 



Meristic variations, 53 



Metabolism, effects of products 

 of, 296; specific, 296, 298, 309; 

 of molluscs, 302, 307; of tad- 

 poles, 306; of DapJmia, 308; 

 products of, and action of 

 environment, 358 



Mice, waltzing, reversion in, 142; 

 acclimatisation in, 386 



Mid-parent, 127, 131 



Migration, effect of, on vari- 

 ability, 219 



Mode, defined, 33 



Modifications, somatic, 223, 242, 

 244 



Moisture, effect of, on barley, 262; 

 on water-reed, 264; on vetch, 

 265; on Mare's tail, 266; on 

 water crowfoot, 267; on Lep- 

 idoptera, 268; on molluscs, 269 



Molluscs, acclimatisation of, to 

 saline solutions, 383 



Molluscs, effect on, of tempera- 

 ture, 231; of light, 252; of 

 lime, 287; of products of me- 

 tabolism, 302, 303, 307 



