272 



INDEX 



Growth — Continued 

 Lungs, 95-96. 

 Ovaries, 100-101. 

 Spinal cord, 90-91, N 202. 

 Spleen, 95. 

 Suprarenals, 99-100. 

 Testes, 101-102. 

 Thymus (on age), 102. 

 Thymus (on body weight), 114. 

 Thyroid, 97-98. 

 Viscera combined, 114. 

 Variations in organ weight, 103-104. 



Heredity 



in general, 29. 

 Coat color, 29. 



Independence 



Attainment of, 19. 



Impregnation 



Time of, 21. 



Length 



of body, 87, N 198. 

 of limb bones, 81-82. 

 of tail, 88-89, N 200. 



Life History, 19, N 189-191. 

 Litter 



Average number in, 26, N 190. 



Second the best, 26. 



Unit for experimental work, 3. 



Litters 



Usual number of, 26, N 190. 



Liver 



Cells and nuclei — diameters, 55-56. 



Menopause, 21. 

 Metabolism 



Protein, 58-60. 



Methods 



Statistical, 2. 



for fixation of brain 



Various figuratives, 49-51. 



Formaldehyde, 51-55. 



Migrations, 11-13. 



Mitosis 



in brain, 41, 42. 



in spinal cord, 41-43. 



Modification of Body Growth 



Experimental, 69, 71. 

 Method of measuring, 5. 



Muscles 



Number of fibers and nuclei, 39. 



Myeline Sheath (-See Nerves) 

 Nerve Fibers (See Nerves) 



Nerves 



Cerebral 



Number of fibers : 



N. cochlearis, 43. 



N. oculomotorius, 44. 

 Spinal nerves and ganglia: 



Number and size of fibers, 45-47. 



Number of ganglion cells, 43-49. 



Diameter of ganglion cells, 44, 48. 

 Peripheral, 48, 49. 



Number of fibers 



N. peronealis, 48. 

 Autonomic 



Fibers less than 4ju, 49. 



Nervous System, 41-49. 

 Fixation methods, 49-55. 

 Physiology of, 61. 



Nitrogen 



Weight of, excreted, 58, 60. 



Norway Rat (See Rat) 



Number 



of mitoses (nervous system), 41, 42. 



of erythrocytes, 40. 



of leucocytes, 40. 



of nerve cells, 41-49. 



of nerve fibers, 41-49. 



of muscle fibers and nuclei, 39. 



Nutrition (See Functions) 



