322 
Meredith, George, quoted, 10, 110, 
203. 
“Metabolism,” 264-265, 268. 
Metchnikoff, on cause of growing 
old, 152. 
on inflammation, 304. 
Microcosm of the egg, 134-141. 
Midwinter, 127-133. 
Milton, quoted, 76, 130. 
Mitchell, Dr. Chalmers, 149. 
Modifications, 305. 
Moore, Professor Benjamin, on 
contents of sea-water, 83. 
Morgan, T. H., his experiments on 
the fruit-fly, 236. 
Murray, Sir John, quoted, 81-82, 
86. 
Mus ramgarettae, 290. 
Nansen, in Far North, 127. 
on restless men, 195. 
Natural selection of variations a 
vera causa in evolution, 225, 
227-228, 
Neger, on ants’ food, 187. 
Nematodes, in food-canal of grouse, 
201, 
Newman, Horatio Hackett, on 
biology of twins, 158-162. 
Newton, Professor, his theory as to 
cuckoos’ eggs, 44, 45. 
Noddy terns, homing experiments 
on, 1-6. 
Noisiest thing in the world, 103. 
Nomadism, 191-197. 
two kinds of, 195. 
Norman, Canon, on shells, 282. 
Odoriferous gland in shrews, 99. 
Odoriferous substances, in butter- 
flies and moths, 97. 
in hound’s tongue and mice, 100- 
Tol. 
in insects, 98, 99. 
in plants, 95-97. 
INDEX 
Odors of mammals and reptiles, 
98. 
cotropbobiosis, nutritive exchange, 
29, 31. 
CEnothera lamarckiana, 240, 241, 
243. 
Ogneff, his experiments on gold- 
fishes, 249. 
Onneas, M. Kammerlingh, his re- 
frigerating laboratory, 180. 
Onychophera, 145. 
Otter, its catholicity of appetite, 121. 
its intensity of parental care, 122. 
its playfulness, 123. 
its resourcefulness, 124. 
its roving spirit, 124. 
its scent, 121. 
its test-time 
frost, 125. 
the survival of the, 120-126. 
Owen, Sir Richard, 291. 
during prolonged 
Parasites, differences of, 199-200. 
effects on hosts, 201. 
great mortality from, 202. 
repulsiveness of, 202-203. 
“ wildness’? and devilry of, 204. 
Parasitism, the problem of, 198-205. 
Parker, Professor G. H., quoted, on 
sense organs, roo. 
Parthenogenesis, 
artificial, 139-140. 
Pathology, the optimism of, 302- 
308. 
Paul, J. Herbert, his work on 
Crustaceans, 170, 172. 
Pavlov, Professor Ivan Petrovich, 
his experiment on  mouth- 
watering of dog, 56-57. 
his investigations on emotions 
and bodily health, 309, 310. 
Pearls, 66-68. 
Pearson, Professor Karl, his study 
of inheritance, 231. 
Penguins, Adélie, observations on 
the habits of, 9-16. 
Peridinians, 81, 87. 
