EXPLANATION OF THE PLATES. 



PLATE XLIV. 



STRUCTURE OF NERVES. 



Fig. 1. Tubes of a motor nerve. The space between the two 

 lines on each margin indicates the thickness of the 

 white substance of Schwann. The waved tube 

 represents the appearance presented by the nervous 

 tubules, when separated from each other in water. 

 670 diameters. 



2. The same in spirit, showing the nucleated threads 



of which the neurolemma is made up. 



3. The same in acetic acid, which breaks up the semi- 



fluid contents of the tubes into globules resembling 

 those of oil. 



4. Portions of Casserian ganglia magnified 350 dia- 



meters. In one of the figures the ganglion cor- 

 puscles are naked ; in the other they are invested 

 with a nucleated capsule. 



5. Nerve tubes of the white substance of the cerebellum 



mixed up with the clear cells described in the text 

 as forming a considerable portion of the white sub- 

 stance of the cerebrum, cerebellum, spinal marrow, 

 and nerves of special sense. 



6. Nerve tubes of the white substance of one of the 



hemispheres of the cerebrum, mixed up with the 

 peculiar cells already referred to. 



7. Tubes of the cerebrum in a varicose condition. 



