152 J. B. JOHNSTON, 
sometimes supplied by small dendrites of mitral cells, but more often 
by other cells. Phot. 82 shows a stellate cell of the granular zone 
one of whose dendrites forms a medium-sized glomerulus. Very 
often two or more kinds of cells send one or more small branches 
of their dendrites into the same small glomerulus. In the adult 
fish there are hundreds of these small glomeruli which receive only 
one or two olfactory fibres and are supplied by the dendrites of 
cells other than mitral cells. The number of these small glomeruli 
is much less in the brain of the young fish. The stellate cells of 
both zones, the spindle cells and the granules may supply glomeruli 
which apparently receive no other central elements. 
Fig. S. 
d) Tractus olfaetorius. 
The neurites of all cells of the olfactory lobe, except the few 
cells of the II type, pass to the fore brain. With few exceptions the 
