NERVOUS SYSTEM 



49 



Greenman ('13) also found in osmic preparations the sectional 

 areas of the 10 largest myelinated fibers and the areas of their 

 axes. The length of nerve used was 10 mm. The results are 

 given in table 33. 



3} Autonomic. In the course of a study intended primarily 

 to determine whether the small myelinated fibers in the spinal 

 accessory could be regarded as representing the fibers of the 

 rami communicantes, Roth ('05) in a series of cervical nerves, 

 counted on one side the number of myelinated fibers 4 n or 

 less in diameter, and in the corresponding ramus communicans 

 he also counted the myelinated fibers of like size. His findings 

 are given in table 34. 



TABLE 34 



c) Technical methods. To determine the effects of various 

 fixatives on the brain of the rat, King ('10) carried through a 

 series of weighings of mature rat brains which had been sub- 

 jected to the action of various fixatives. A summary of the 

 results is given in table 35. 



The solution of Ohlmacher ('97), the formula for which is as 

 follows : 



Absolute alcohol, 80 parts. 



Chloroform, 15 parts. 



Glacial acetic acid, 5 parts. 



Corrosive sublimate to saturation (about 20 per cent) 

 was found to give excellent results with the cells of the cerebral 

 cortex. 



