INDEX 



497 



Tumors, rare sites of, 229 



recurrence of, 170 



relation transplantable to spontaneous, 

 301 



somatic mutation as cause of, 303 



spirochetes in, 431 



stroma of, 1 70 



transplantation (see transplantation of 

 tumors) 

 Turning of embryo, 44 

 Typhoid (see mouse typhoid) 



U 



Ulcers, 397, (see also pyogenic infections) 

 due to Corynchacteriiim miiris, 397 

 in infectious ectromelia, 436 



Ureter, 131 



Urethra, female, 132 

 male, 143 



Urinary bladder, 132 

 tumors of, 221 



Urinary system, 130 



Uro-genital system, tumors of, 221 



Uterine epithelium, implantation changes in, 



7 

 Uterus, 155 



changes during estrous cycle, 72 

 pregnancy, 37 

 in pseudopregnancy, 79 



tumors of, 225 



V 



Vagina, 157 



age at opening, 58 



changes during estrous cycle, 69 



epithelium of, 71 



mucification of in pregnancy, 68 

 Vaginal plug, 55 



smears, 67 

 mucus in, 68 

 Valves, of the heart, 91 



of veins, 90 

 \'ariation, between strains, misinterpretation 

 of, 346 



causes of, 331 



effect of inbreeding on, 334 



in embryos, 2 



in hybrids, 341 



measurement of, ^^t, 



under random mating, 327 



within strains, misinterpretation of, 345 

 Vas deferens, 137 



Vasa efferentia, 136 

 vasorum, 90 



\'eins, 90 



\'entricles, of the heart, 90 



\'esicular glands, 55, 140 



Vibrissae, 107 



Vigor (see also hybrid vigor) 

 in inbred strains, 334, 343 



Mlli, intestinal, 120 



X'irus diseases, 408, 434 (see also lilterable 

 organisms) 

 encephalomyelitis of mice, 443 

 inclusion bodies of liver, 452 

 infectious ectromelia, 434 

 lymphocytic choriomeningitis, 438 

 salivary gland inclusion bodies, 451 

 virus pneumonia, 448 



Virus pneumonia in mice, 448 



Vitellus, 2 



W 



W strain, skin tumors in, 195 

 White pulp, 97 



X 



X strain, osteogenic sarcoma in, 207 

 skin tumors in, 195 



X zone, of adrenal, 103 



Xcnopsylla cheopis, 371 



X-rays, effect on latent infections, 425 

 irradiation of ovaries, 63 

 mice sterilized with, 65 

 translocations induced by, 242 



Y 



Y (yellow) strain, lipoid tumors in, 269 

 lipoma in, 200 

 liposarcoma in, 204 

 liver tumors in, 220 

 osteogenic sarcoma in, 207 

 Yolk cavity, 7 



relation to yolk-sac, 36 

 Yolk-sac, 36 



as organ of exchange, 40 

 change in shape of, 51 

 circulation in, 51 



Zcnopsyllci cheopis, 363 

 Zona pellucida, 2, 149 



disappearance of, 7 



