376 THE SOLIDS. 



" It follows from these facts, that one can no longer doubt 

 the existence of the two orders (altogether extinct) of ele- 

 mentary nerve tubes named above, which, nevertheless, some 

 authors have done recently. (Kolliker.) 



" The two orders of globules, and of the corresponding 

 tubes, exist in the posterior or sensitive roots of the nerves of 

 the spinal cord, but the globules do not exist in the anterior 

 or motor roots. 



" They exist also in the ganglions of the encephalic nerves 

 and of the great sympathetic ; only in these last there is a 

 much greater number of globules and of slender tubes than 

 of globules and of large tubes (thirty or fifty to one), more 

 or less according to the ganglions. In the spinal ganglions, on 

 the contrary, there are about four or five globules and large 

 tubes to one of the other kind. 



" These facts tend to confirm the observations of ana- 

 tomists who have pointed out the existence of the two orders 

 of elementary tubes in the nerves of animal life and those of 

 the great sympathetic, but with predominance of the large 

 tubes in the first, and of the slender tubes in the second ; not- 

 withstanding which no one of them has pointed out the ex- 

 istence and the difference of the two orders of ganglionary 

 globules. 



" The absence of ganglionary globules on the anterior or 

 motor roots of the spinal nerves anatomically distinguishes 

 the elementary tubes of motor nerves of animal life from 

 those of the sensitive nerves. But this decisive character 

 can be remarked only in the short course of the roots of the 

 spinal nerves before their union and the mixture of their 

 tubes. If wishing to push still further the deductions to be 

 drawn from the preceding facts, we demand of ourselves 

 what functions should be attributed to the ganglionary 

 globules, we should answer, that they are the modifiers of 

 the action which takes place in the^ sensitive and in the or- 

 ganic nerves ; but it is impossible to determine the nature of 

 this modification. 



" Since the ganglia of the sympathetic and of the cerebro 

 spinal nerves enclose the same ganglionary globules and the 



