164 Journal of Comparative Neurology. 



paratus was somewhat larger and its fibrils finer. The endings 

 in the lizard and frog are not surrounded by a special sheath, 

 being distingushed in this respect from endings found in birds 

 and mammals. ( Vide infra). 



In the tendons of man and other mammals Golgi found 

 two distinct types of end-organs. The one type, which resem- 

 bles closely the corpuscles found in the conjunctiva and glands, 

 will here receive no further mention, as they are foreign to the 

 present contribution. 



The other type to which he gives the name nervous mus- 

 lo-tendinous end-organs (" nefvose miisado-teiidinose Endorgane ") 

 is deserving of further consideration. 



This organ is of spindle form and varies in size from such 

 as are 70-80 // broad and 300-400 // long to such as have a di- 

 ameter of 100-120;/ and a length of 800 /^ or even longer. 

 One end of the spindle is always attached to a muscle bundle, 

 while the other, which may be unbranched or double, becomes 

 continuous with tendon fasciculi. 



The line of demarcation between spindle and surrounding 

 tendon fasciculi is usually quite distinct, the boundary of the 

 spindle being often marked by a glistening line, along which 

 nuclei are seen. The presence of a capsule does not seem indi- 

 cated by this glistening line, although in silver nitrate prepara- 

 tions it would appear that there was present a superficial endo- 

 thelial covering. 



Golgi states that often only one medullated nerve goes to 

 a spindle : not seldom, however, spindles to which two, three 

 or four medullated nerve fibers go, may be seen. The medul- 

 lated fibers, after entering the spindle, divide into primary, sec- 

 ondary and tertiary branches, these still retaining their medul- 

 lary sheaths and diverging as they approach the periphery of 

 the spindle. After the medullated branches have lost their 

 myelin, they divide into several diverging branches. Golgi's 

 account of the ending of these non-medullated branches is as 

 follows: " Wenn sie da angekommen sind " (when the non- 

 medullated branches reach the periphery of the spindle) " bild- 

 en sie durch noch feinere und haufigere Zertheilungen in kurzen 



