NERVOUS SYSTEM 



43 



The diameters of the Purkinje cells have been studied by 

 Addison, '11. 



The Albinos were from the stock colony of TheWistar Institute, 

 reared on the scrap diet. The cerebellum was fixed in Ohlmach- 

 er's solution (King, '10) imbedded in paraffin and stained with 

 carbol-thionine and acid fuchsin. The values for the respective 

 diameters given in table 24 are in each instance averages of ten 

 measurements from the largest cells found in equivalent areas at 

 the several ages. The measurements stop at 20 days of age. 

 After this age there is but little change in the diameters of the 

 largest cells. 



TABLE 24 

 Diameters of Purkinje cells and their nuclei 



2) Spinal cord. For the weight of the spinal cord see Chapter 



7, p. 90, and table 68. For the percentage of water see Chapter 



8, p. 176, and table 74. For the chemical composition see Chap- 

 ter 9, p. 180 and table 80. Cell division in the spinal cord after 

 birth has been studied by Hamilton, '01, see table 22 and Allen 

 (12) see table 23. 



b) Peripheral. 1) Cerebral nerves. Fortuyn ('14) counted 

 3000 myelinated fibers in the n. cochlearis of the Norway rat. 



Boughton ('06) studied the increase with age (body weight) 

 in the number of myelinated fibers in the oculomotor nerve in 

 the albino rat and measured the areas of the entire fiber and the 

 axis in osmic preparations. The results are given in table 25. 



2) Spinal nerves and ganglia. One of the larger spinal 

 ganglia from a cervical nerve root of an Albino weighing 140 

 grams was fixed in a formalin-acetic sublimate mixture (6, loc. 



