NERVE CUTTING IN AMIURUS aan 
pass up through the papilla in a more or less compact bundle 
and then spread out to form a plate-like plexus against the base- 
ment membrane immediately beneath the bud. In many sec- 
tions the nerve fibers appeared to end in this plate, but careful 
search would nearly always reveal fibers, more often brown than 
black, extending up from this plate and coming to lie between 
the sense cells. These intrageminal fibers were never so numer- 
ous as the fibers leading up to the base of the bud, nor did they 
become so heavily impregnated with silver. Retzius (’92) gives 
several figures showing the innervation of the ‘Endknospen’ of 
various fishes. Those of the teleost Gobius, plate XI, figures 
9, 10, represent very closely the condition in Amiurus. So far 
as could be observed, the intrageminal fibers do not enter the 
sense cells, but only lie between them. In mammals, nerves 
lose their myelin sheath as they pass into the taste bud. No 
special preparations of Amiurus were made to determine whether 
this is the condition in it, but the difference between the power 
of these intrageminal fibers to take silver and that of fibers 
which, from osmic-acid preparations, were known to be medu- 
lated, may be due to the absence of a myelin sheath. Arnstein 
(93) describes the intrageminal fibers of the dog as surrounding 
and lying on the taste cells, but Kolmer (710) claims that he 
has found in the hedgehog two kinds of fibrils within the cells. 
The system of capillaries by which each bud receives its blood 
supply is especially striking. Along the wall of each dermal 
papilla very small vessels can be seen (figs. 1, 3), which are 
connected with the larger vessels running longitudinally in the 
barbel. These small vessels open into an extension or sinus 
immediately beneath the basement membrane on which the bud 
may be said to rest (fig. 3). The vessels along the side of the 
papillae are seldom of large enough diameter to contain two 
erythrocytes side by side, but the space just beneath the bud 
often contains a solid mass of them. The papilla thus consists 
of a peripheral layer of pigment cells, and a central core of con- 
nective tissue, through which pass nerves and _ blood-vessels. 
Most frequently there are to be found in that portion of the taste 
bud distal to the nuclei of the sensory cells certain cells which 
