INDEX 



555 



Cowpox, inoculations with, 421-423 

 Cows, increased products from, 344 

 Cretinism, 194 

 Cretins, cause of, 194 

 Criminals, heredity of, 361 

 Crinoidea, 522 

 Crops, rotation of, 409-411 

 Crossing-over, of genes, 339, 340-341 

 Crustacean, 524 ; the young of, 296 

 Culex, house mosquito, 483 

 Cuts, treatment of, 168 

 Cuttings, method of vegetative propaga- 

 tion, 255-256 



Cyclostomata, animals of Order, 524 

 Cytoplasm, 58 ; structures found in, 57 

 Cyton, of nerve, 208, 209 



Dakin solution, 55 



Darwin, Charles, 371 ; on natural selec- 

 tion, 373-376 



Darwinian theory, of evolution, 373- 

 376 



Darwin's, theory of, evolution, 373-376 ; 

 over-production, 374 ; struggle for 

 existence, 374 ; variations, 374-376 ; 

 survival of the fittest, 374 ; inherit- 

 ance, 374-375 



Davenport, Charles, 355 ; work in eu- 

 genics, 356 



da Vinci, Leonardo, 163-164 ; on fossils, 

 371 



Defecation, 135 



Demospongia, animals of class, 521 



Dendrites, 86-87 ; axon, 208 



Dentine, 107 



Dentrification, process of, in soil, 407 



Dermis, structure of, 172 



Development, progressive. See Organic 

 evolution 



Development, influenced by ancestry, 

 310-313 ; influenced by environment, 

 313-315 



Development of species, use and disuse, 

 372 



de Vries, Hugo, experiments with eve- 

 ning primroses, 337 ; mutation theory 

 of, 376-377; portrait of , 335 ; theory of 

 evolution, 376-377 ; mutants, 376-377, 

 338-339 



d'Herelle, on immunity, 508-509 



Diabetes, insulin in treatment of, 199 



Dick test, for scarlet fever, 458 



Diet, complete, 93 ; essential, 104 ; in- 

 sufficient, 93 ; insufficient in min- 

 erals, 95-96 ; insufficient in proteins, 

 93, 95 ; investigation by McCollum on, 

 93, 95 ; laboratory problem on per- 

 sonal, 105; relation of teeth to, 111- 

 112 



Digestion, and absorption, 125-141 ; 

 chart of chemical, 134 ; hygiene of, 



138-139; in mouth, 120712!; in 

 plants, 38 ; in small intestines, 132- 

 133, 135 ; laboratory problem of rela- 

 tion of size of protein food to time of, 

 126 ; laboratory problem of relation of 

 different animal proteins to, 127 ; life 

 function of amoeba, 43 ; meaning of, 

 117-118; process of, 117-119; sali- 

 vary, 121-122, 130 ; time necessary 

 for, 133, 140 



Digestive organs, of frog, 114-116, 117; 

 of man, 116-117, 119 



Digestive system, 114-123; function of, 

 117; laboratory study of the frog's, 

 114-116; laboratory study of man's, 

 117 



Dinosaur, amphibian, 383 ; eggs of, 

 306 ; restoration of, 372 



Diphtheria, ages most susceptible to, 453 ; 

 causes of, 453454 ; diagnosis, 457 ; 

 discovery of active immunity to, 452- 

 453 ; discovery of antitoxin of, 451- 

 452 ; effect on the body, 454 ; history 

 of, 450 ; isolation of organism of, 

 450 ; isolation of toxin of, 451 ; pre- 

 vention of, 457-458; Shick test of 

 susceptibility, 453 ; transmission of, 

 454-455 ; treatment of, 455-457 



Disease, and health, 413-414 ; and men- 

 tal poise, 502-503; causes of, 494; 

 due to bacteria, 445, 455, 459, 482, 

 492 ; due to physical agents, 473 ; im- 

 munity of animals to, 345 ; immunity 

 of plants to, 347 ; inheritance of, 368- 

 369 ; safeguards of the body against, 

 496-503 ; caused by toxin, 450-451, 458 



Division, cell, process of, 41 ; purpose of, 

 40 



Division of labor, physiological, 66-67 



Division, reduction. See Maturation 



Dominance, complete, 323-324 ; incom- 

 plete, 318-321 ; meaning of, 323 ; 

 Mendel's or Mendelian law of, 322-324 



Dominant characters, 323-324; list of, 

 333 



Dogs, developed from common ancestor, 

 310, 311 



Duck bill, 384, 513 



Duct, thoracic, 165 



Ductless glands, 191-201 ; adrenal, 197- 

 199 ; pancreas, 199 ; parathyroid, 196 ; 

 pineal, 200; pituitary, 196-197; re- 

 productive, 200-201 ; secretions of, 

 191-192 ; spleen, 200 ; thymus, 199- 

 200 ; thyroid, 192-195 



Dujardin, protoplasm named by, 28 



Dwarfism, 197 



Earth, age of, basis for estimate of, 378- 

 381 ; calculations of, 378 ; evidences 

 of, 378-379, 380 



