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of these processes have, generally, varicose thickenings at each places 
where they subdivide. They have, generally, also a great many 
varioceles where no side-branches are seen, I suppose, however, this 
is only owing to an imperfect staining, and that side-branches are 
given off at each variocele. 
The branches of the nervous processes do not anasto- 
m ose. — They contribute to form a reticulation, or rather interlacing 
of nervous fibrillæ which extends through the grey substance, and 
which also seems to extend into the white substance. 
The origin of the peripheral nerve-tubes. — In horisontal 
sections of successfuU chromo-silver stained preparations of the 
spinal cord, it is easy to observe that, the nerve-tuhes of the 
dorsal (poster ior) nerve-roots ') subdivide dichotomically, just after 
their entrance into the spinal cord; some of them subdivide even 
before they have reached the cord (vide fig. 
As far as my experience goes I dare to say that all nerve-tubes 
subdivide, it has in my opinion therefore, only been optical illusions 
which have occasioned previous outhors (e. g. RanSOM & THOMPSON 
[1. c. 1886] and others) to state that, they have observed some of 
these nerve-tubes to originate directly from ganglion cells; these 
authors will, I hope, forgive me this denial of their statements, when 
I tell them that such an illusion has once deceived myself, before 
I obtained perfect chromo-silver stained prepations (cf my previous 
paper 1. c. 1886). The fibres which I at that time observed (and 
which probably the other authors have also seen) were neuroglia- 
fibres issuing from neuroglia-cells in the grey substance and inter- 
mixing with the nerve-tubes of the dorsal nerve-roots (vide fig. 93, f^.) 
The two branches resulting from the dichotomical subdivi- 
sions of the nerve-tubes separate, and run 'm\ opposite directions, 
longitudinally, along the spinal cord. I have been able to trace 
these branches for considerable distances along the cord but, as 
a rule, I have found no new subdivisions ; neither have I seen 
them passing over to the other side of the spinal cord. In a very 
few cases, I belive to have seen very slender side-branches to be 
given off (vide fig. 112, br). My investigations on this subj ect are very 
far from being finished, and I hope yet to be able to make im- 
portant observations in this respect. From what is already observed, 
1) It may be noticed that in my previous paper (1. c. 1 886) there is in the 
English translation (Ann. mag. nat. hist. 1886) printed «dorsal nerve-rods« and 
»ventral nerve-rodsc< instead of dorsal fierve-roots and ventval nerve-roots. 
