12 
Mr. Home’s Lecture, &c. 
sections less transparent; from which it is natural to suppose, 
that the internal parts of the optic nerve are not so compact as 
in other nerves, and therefore it is better fitted for examination. 
These experiments show, that the nerves do not consist of 
tubes conveying a fluid, but of fibres of a peculiar kind, dif- 
ferent from every thing else in the body, with which we are 
acquainted. The course of these fibres is very curious; they 
appear to be constantly passing from one fasciculus to another, 
so as to connect all the different fasciculi together by a mixture 
of fibres. This is different from the course of blood-vessels, 
lymphatics, or muscular fibres : the only thing similar to it, is 
in the formation of nervous plexuses ; which leads to the idea 
of its answering an essential purpose, respecting the functions 
of the nerves. 
