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F. W. CARPENTER AND J. L. CONEL 



short, branched dendrites. These cells are numerous in the various 

 ganglia of the system. It is equally certain that his sensory type 

 is represented by figure 2. Regarding this form of neurone 

 Dogiel states that the cell-body may be conical or club-shaped, but 

 never flattened; that it is usually somewhat larger than the first 

 type; that the processes, which may number 16 or more, are finer, 

 longer, and have fewer branches; and that the cells are not as 

 abundant, being, in some of the smaller ganglia, altogether absent. 



Fig. 1 Ganglion cell representing Dogiel's "motor type" from the superior 

 cervical ganglion of the cat. Silver-nitrate preparation. 



Fig. 2 Ganglion cell representing Dogiel's "sensory type" from the superior 

 cervical ganglion of the cat. Silver-nitrate preparation. 



Although cells answering to the description of Dogiel's two 

 types are present in our preparations, we are not, however, con- 

 vinced that these cells are representatives of two distinct cate- 

 gories. If they are cells of opposite function, one being afferent 

 and the other efferent, then we might, by analogy, expect to 

 find them clearly differentiated structurally into two sharply de- 

 limited groups without intermediate forms. This is true of the 



