234 



THE NEXT GENERATION 



Oxygen, how secured by fish and 



by land animals, 64, 65 

 Oysters, illustrating prodigality of 



nature, 58 



Paleontologist (pa le on tol'o jist), 

 work of, 40 



Paraguay, 75 



Pasteur, Louis, 202 



Patriotism, modern type of, 164 



Peas, color inheritance in, 21 ; domi- 

 nant and recessive characters of, 

 22 ; inheritance of seed characters 

 in, 23 



Pig, Poland China, I 



Pigeons, different kinds of, 51, 52 



Plum, development of, 31 



Plymouth, typhoid epidemic in, 60 



Polydactylism (pol i dak'ti lizm), il- 

 lustration of, 76; definition of, 77 



Poppy, improvement of, 30 



Potato, increased value of, 29 



Potato bugs, migrations of, 88-94 ; 

 comparison of, with Hawaiian 

 snails, 93, 94 



Potter, Mr., 193 



Poulton, Mr., 76 



Prodigality, Darwin's law of, 58 



Pure-bred, definition of, 18 



Rabbit, generations of, each year,i 2 ; 

 condition of, at birth, 114 



Race improvement, three steps in, 

 196-199 



Race regeneration, 201, 204 



Recessive character defined, 15 



Rochester, clean milk in, 200 



Rorqual, giant whale, 69 



Rudiments, definition of, 65 ; in 

 calves, 65 ; in the whale, 65 ; Dar- 

 win's statements about, 67 ; prov- 

 ing history of whale, 67 



Sacculina (sakuli'na), description 

 of, 66, 67 



Schamberg, Dr., 165, 166 



Scott, Professor, 77 



Seaver, Dr., 141 



Sex, significance of, 162 



Sheep, varieties of, 31, 32; short- 

 legged, 76 



Shoes, Chinese, 73 



Snail shells, studied by Dr. Gulick, 

 81-87 ; reasons for so many 

 species of, 87 



Social inheritance, 143 



Sommerville, Lord, on sheep breed- 

 ing* 54 



South America, 45, 48, 49, 51 ; size 

 of animals in, 47 ; death of ani- 

 mals in, for lack of water, 60 



Spargo, Dr., 199 



Species, description of, 50, n.; in- 

 fluence of environment on, 95, 99 



Spencer, Herbert, reference to, 

 61, n. 



Sperm cells, 106, 107 



Sphygmograph (sfig'mo graf), tests 

 with, on tobacco users, 136-139 



State Liquor Dealers of Ohio, 149 



Stockard, Dr., 119, 121 



Struggle for existence, the law of, 



58, 59 



Survival of the fittest, the law of, 61 

 Switzerland, studies of feeble- 

 mindedness made in, 122, 123 

 Syphilis (sif'i Us), methods of com- 

 munication of, 166-168; protec- 

 tion from, 171 



Tadpole, from unfertilized egg, 100, 

 101 ; as influenced by environ- 

 ment, 114 



Tertiary Bad Lands, mention of, 40 

 Thompson, Dr., 57, 58 

 Thyroid (thi'roid) gland, 181 

 Tobacco, why used by boys, 132; 

 effect of, on heart action, 136, 

 139; double nature of, 140; ef- 

 fect of, on Yale students, 141 ; 

 use of, studied by Dr. Meylan, 142 

 Tower, Dr., 80, 89, 90, 92, 93, 96, 



97> 98, 99 

 Toxodon (tok'so don), description 



of, 46 

 Treves, Sir Frederick, 146 



University of Chicago, The, 96 



Variation, Darwin's law of, 60 

 Vertebrates, evidences of similarity 

 in, 70 ; individual life of, how 

 started, 101 ; four statements in 

 regard to, 113 



