CHAPTER 7 



GROWTH OF PARTS AND ORGANS IN RELATION TO 

 BODY LENGTH AND IN RELATION TO AGE 



1. Introduction. 2. Measurements — Methods of Examination — Graphs 3. 

 Body length on body weight: Body weight on body length: Tail length on 

 body length (a) Body weight per millimeter of length. 4. Organs with early 

 rapid growth. 5. Organs with a nearly uniform growth, 6. Organs with a 

 sinuous graph of growth. 7. Variability. 8. General tables: Entire body on 

 age: Prenatal — Postnatal: Increase in length and weight of parts and organs on 

 body length. 9. Weight of thymus on age. 10. Weights of viscera. 11. Values 

 for other characters linked with age. 12. Formulas. 



1. Introduction. The organs, the growth of which has been 

 followed are tail (length), brain, spinal cord, eyeballs, heart, 

 kidneys, liver, spleen, lungs, blood, alimentary tract, testes, 

 ovaries, hypophysis, suprarenals, thyroid and thymus. 



The foregoing were presented in the first edition of this book. 

 In the present edition there have been added from the Institute 

 laboratory full tables on the epididymis, pancreas, stomach and 

 submaxillary glands, together with crude data on the lens, pmeal 

 and prostate gland, and from other laboratories we have deter- 

 minations (Osterud, MS.) of the growth of the parts of the female 

 reproductive tracts. In addition, there are given tables on the 

 growth in weight of the parts of the brain (Sugita, '17). The 

 growth of the skeleton and its parts (Donaldson and Conrow, 

 '19) has been considered on pages 183-198. 



All the observations were made on stock Albinos from the 

 colony at The Wistar Institute, except those for the total blood, 

 which are based on the records of Chisolm, '11, and those for the 

 parts of the female reproductive tract (Osterud, MS.). 



The mean values for the several organs were in each instance 

 charted and with these as a guide a theoretical graph was found 

 which could be expressed by a formula or a series of formulas. 

 All the formulas were devised by Dr. Hatai. 



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