64 HUBER. [Vol. XVI. 



Van Gehuchten, Sala, and Dogiel have observed a similar 

 arrangement of the dendrites of the sympathetic cells in the 

 ganglia of Mammalia ; they, however, regard the nest-like 

 arrangement as accidental. A study of PI. V, Fig. 21, may 

 show that the latter interpretation seems the more plausible 

 one, and especially if we take into consideration that such 

 dendrites are extra-capsular. It is further to be remembered 

 that if these dendrites have the power to conduct nervous 

 impulses, as they no doubt may have, they would, reasoning 

 from analogy, conduct toward the cell body — be " cellulipetal" ; 

 and I am at present not aware of any instance where a dendrite 

 is stimulated by the cell body or dendrites of another neuron. 

 We may thus assume that the arrangement of the dendritic 

 branches of the sympathetic neurons in the sympathetic ganglia 

 of birds is mainly accidental, depending in a great measure on 

 the relative position of contiguous ganglion cells. Participating 

 in this network between the ganglion cells as above described, 

 are found non-medullated and medullated nerve fibers. The 

 former are, no doubt, in part the neuraxes of the sympathetic 

 cells of the ganglion. In serial sections, however, it may be 

 seen that some of the non-medullated fibers enter the ganglia 

 from without ; this, both Cajal and Lenhossek have described. 

 The latter pictures in his article (Fig. 13) a bundle of such 

 fibers entering a ganglion. This figure, as the descriptive text 

 shows, was sketched from a dorsal sympathetic ganglion of a 14- 

 day chick. Lenhossek has this to say concerning these fibers : 

 "Wir haben es hier offenbar mit den Fortsatzen von ander- 

 weitig, etwa in den visceralen Ganglien gelegenen sympa- 

 thischen Zellen zu thun." He goes on to say that the ending 

 of these fibers is by a simple end brush and not by an end basket; 

 and, to quote again : " Wobei Endaste manchmal auffallende 

 Verdickungen zeigten, an den Stellen, wo sie sich an die Zellen 

 anlegten." An ending such as here described has not been 

 seen by me. The non-medullated fibers, as far as I have been 

 able to determine, are always extra-capsular, and do not there- 

 fore end on the cell body of the sympathetic cells. A few 

 times, however, an ending such as shown in PI. V, Fig. 20, has 

 been seen by me. In this figure, which is a portion of a section, 



