1/6 Journal of Comparative Neurology. 



the muscular extremity of the tendon. These tendon nerves, 

 in the frog and toad, end in the shape of groups of tufts of fine 

 varicose fibrillae, situated between the tendon fibers. The 

 number of tufts depends on the number of meduUated fibers 

 entering the tendon, this in turn depending on the size of the 

 animal and therefore the size of the tendon. These nerve 

 endings are situated at different depths in the tendon. His fig- 

 ures agree in the main with those given by us. 



In the same year, appeared a communication from Ivan- 

 hoff, in which among nerve endings in other connective tissues, 

 he describes the sensory nerve endings in the fascia lumbo-dor- 

 salis and fascia transversalis and the fascias of the anterior and 

 posterior extremities of the rabbit, cat and dog. The method 

 used by Ivanhoff also, was the intra-vitam methylen-blue meth- 

 od of Ehrlich. He describes three types of endings: (i) 

 those in the form of a tassel ; (2) some in the form of a bush ; 

 and (3) others in globular form. The terminal filaments may 

 end abruptly or in an enlargement or in a more or less compli- 

 cated ending resembling a snare. These endings have no cap- 

 sule and are identical, according to Ivanhoff, with the nerve 

 endings in tendon. While some of the figures given by Ivan- 

 hoff resemble somewhat the nerve plaques found in the simpler 

 tendon end-organs, we do not think, either from his description 

 or his figures, that these endings can be considered identical 

 with the endings found in the neuro-tendinous end-organs of the 

 animals he has studied. 



In turning now to our own observations, we may again call 

 attention to the methods used by us. As may have been ob- 

 served, all investigators, with the exception of Smirnow and 

 Ivanhoff, who have studied nerve end-organs in tendon, have 

 employed one or the other of the gold chloride methods, or 

 platinum chloride, for staining the nerve terminations. And 

 while it is not our purpose to reflect in any way on the results 

 obtained with these methods, and while we are ready to accord 

 all observers who have used them due credit for the many valu- 

 able observations which they have made, we can but feel that 

 the methylen-blue method, as used by us, and especially in the 



