2o8 Journal of Comparative Neurology. 



erable detail. For this reason a recapitulation is given which 

 embodies the leading results without descriptive details. 



My observations have been made from serial sections of 

 A. ttgnnum, fixed in Flemming's solution and stained by 

 Weigert's method for medullated nerves. By means of 

 these -^sections the nerve roots have been identified with pre- 

 cision. Where they enter ganglionic complexes their compo- 

 nents have been traced through the ganglia and into the nerve 

 trunks. When there is doubt as to the peripheral relations of 

 root fibers it is explicitly so stated. 



In Part Second I have discussed certain morphological 

 questions which have arisen from my observations and have 

 reviewed literature onh' so far as it bears directly upon these 

 questions. A further general review would seem superfluous 

 here in view of the recent work of Strong ('95) and 

 Kingsbury ('95). These gentlemen have reviewed the 

 literature bearing upon the amphibian nervous system in a very 

 comprehensive manner, and since their contributions little has 

 been added to the anatomy of the subject. Indeed, it is aston- 

 ishing how meagre the available data are which contribute 

 definitely to our knowledge of the nerve components of 

 Amphibia. It is a remarkable fact that Rana, Spelerpes and 

 Amblystoma are the only Amphibians which have been the 

 subjects of comprehensive reports upon which comparisons can 

 be satisfactorily based. There are many descriptions of dis- 

 sections from which general inferences may be drawn, but in 

 all such work the central relations of neurones are doubtful. 

 Excellent as these researches may be in consideration of the 

 methods employed in them, they are at best of little value in 

 the solution of the present neurological questions. My refer- 

 ence has, therefore, been for the most part to a few recent 

 writers upon the cranial nerves of Ichthyopsida. 



In treating of the components of the cranial nerves I have 

 used the term "general cutaneous" as applying to afferent 

 neurones whose axones or collaterals enter the tractus spinalis n. 

 trigemini; the term "communis," as applying to those 

 neurones whose axones or collaterals enter the fas-iculus com- 



