Huber-DeWitt, Neufo-tetidinous End-organs. 167 



chi are considered by the author as nerve endings Hke those of 

 Pacini and Krause, but less developed. 



In the aponeurosis of the pectoral muscles of the dove, he 

 finds neuro-tendinous end-organs more numerous and more elon- 

 gated than in the turtle, but containing plaques similar to those 

 described above. 



In mammalia (dog, rabbit and man), the plaques are the 

 same as in the lizard, but the nuclei are larger, more granular 

 and more abundant and more plaques are grouped together 

 within one connective tissue sheath to form the neuro-tendinons 

 organ. 



Opposing the idea of Golgi that these organs are always 

 muscular at one extremity and tendinous at the other, which 

 gave to them the name " musculo-tendinous end-organs," Pan- 

 sini states that he has found neuro-tendinous end-organs fre- 

 quently, in mammalia as well as in the lower vertebrates, which 

 were tendinous at both extremities. Besides these organs, he 

 also finds in tendon, corpuscles resembling those of Pacini, 

 Meissner and Krause. From Pansini's descriptions and from 

 his figures, compared with the corresponding figures of Ciaccio 

 and with our own, we are led to conclude that in his prepara- 

 tions, the ultimate terminations of the non-medullated fibers 

 were very imperfectly stained. 



Contemporaneously with Pansini, Cattaneo published the 

 results of his investigations with the double chloride of gold 

 method, applied to tissues previously made transparent by im- 

 mersion in arsenic acid and fixed in osmic acid. His studies 

 were confined to neuro-tendinous end-organs of guinea pigs, 

 rabbits, cats and dogs. Cattaneo's minute description of the 

 general structure of the organ does not differ materially from 

 that given by Golgi. He demonstrates, however, a distinct 

 capsule for the spindle, consisting of one or several layers of 

 fine, interlacing connective tissue fibers, which, in his silver ni- 

 trate preparations, are seen to be covered by a layer of large, 

 polygonal endothelial cells with round or oval nuclei, resem- 

 bling those described by Ranvier for the sheath of Henle ; the 

 author concludes from this, that the sheath of Henle of the 



