108 THE CONNECTIVE TISSUES, BY A. ROLLETT. 



Also the appearance which has already been described in 

 the digital tendons of the Frog may again be alluded to. 

 The same features are presented by other tendons, especially 

 amongst the Amphibia. It must, however, here be stated that 

 objections have been raised to considering these cells to be 

 cartilage cells* It is certain that in the cells of these tendons 

 of the Frog no chondrin-yielding substance can be proved to 

 be present. In preparations treated with chloride of gold, 

 masses of equably stained protoplasm are found in close 

 apposition. 



PARENCHYMATOUS CARTILAGE (Cellular cartilage). We must 

 now describe a form of cartilage which possesses no matrix, 

 the so-called parenchymatous cartilage. Kolliker^ has also 

 sought to introduce this type amongst the tissues. Thus, 

 amongst the cartilages without intermediate substance, he 

 enumerates the chorda dorsalis of embryoes and of many adult 

 fishes, numerous foetal cartilages, some parts of the cartilage of 

 Myxinoid fishes, a part of the branchial laminae of fishes, the 

 cartilage of the Tendo Achillis of the Frog, and of the outer ear 

 of many Mammals ; the cartilage entering into the structure 

 of the Geryonia, Annelida, Cephalophora, and of Limulus. This 

 grouping, however, is decidedly imperfect. Kolliker distin- 

 guishes between the capsule or membrane of the cartilage cells, 

 consisting of chondrin-yielding substance, and an intercellular 

 substance existing between the cells, but also yielding chon- 

 drin on boiling ; but, inasmuch as all the chondrin-yielding 

 substance of cartilage is referrible to the capsules, a number 

 of the cartilages described by Kolliker as destitute of inter- 

 mediate substance must be regarded as belonging to the 

 hyaline cartilages. How far, on the other hand, we are justified 

 in speaking of naked cartilage cells, and of considering the 

 cellular form of cartilage as composed of them, is not as yet 

 determined. 



On this point we can only refer to embryological observations, 



* Gegenbauer, Jenaische Zeitschrift fur Medicin und Naturwissenschaften, 

 1866, p. 307. 

 t Gewebelehre. Leipzig, 1867, pp. 66, 67. 



