94 



F'roTi its outer anJ, a single stout liealrite proceels straight 

 to(»ard the periphery. This dendrite branches bat sparsely, 

 and no branches are given off for some distance beyond the 

 point of its origin. The several branches pass oatward through 

 the niddle layer of neurones, and the most delicate twigs can 

 be traced into the superficial layer of nerve-fibres. The 

 'Thole deniritic series presents a top both tall and narro/r, 

 in strong contrast to the for-n assurnei by the neurone of tne 

 middle layer. Seramules are scattered over the branches, but 

 they are conspicuous neitaer for their size nor their numbers. 



There may be other minor dendrites arising from near the 

 base of the cell, as sho/»n in Pig. 23; but the axone always takes 

 origin from a point opposite the principal dendrite. The axone 

 is directei toward tne limitans interna. It may be traced for 

 some distance without any very marked dimination of size. Wany 

 collateral branches are given off in its course, and the ulti- 

 mate destination of the principal stem appears to be a bundle 

 of fibres contributing to the stratum meiuUare profundum. 



The body of the cell is so largely filled with the nucle- 

 us that often only the thinnest investing film of cytoplasm 

 is exhibited. Six cells from this layer have their structural 

 features shown in Pig.o3, and one of these has the thinnest 

 enveloping cytoplasm found in this class. The nucleus of a 

 cell is regularly oval in contour, holding one prominent nucle- 

 olus. The chromatic network is delicate and of small mesh. 



The cytoplasm contains masses of tigroid substance which. 



