104 THE CONNECTIVE TISSUES, BY A. ROLLETT. 



and Trommer * The chondrin-giving substance of cartilage, 

 unlike the gelatine-yielding substance of connective tissue, does 

 not swell up in water. Acetic acid causes it, when obtained 

 from some cartilages, to become somewhat clearer, whilst 

 in others it renders it cloudy. It does not cause it to swell up. 



After exposure for from eight to twelve hours to the action 

 of solution of osmic acid, containing one-fortieth per cent., thin 

 sections of cartilage exhibit a system of dark striae, usually 

 running in a straight direction through the matrix, which fre- 

 quently connect the several cell cavities with one another. Bub- 

 noff,f in describing these striae for the first time, expresses his 

 opinion that they are to be regarded as juice canals. 



The divisibility of the matrix of hyaline cartilage into capsules 

 of various orders, or cell territories as they have been termed, 

 shows that we cannot regard the matrix as an excretion of an 

 amorphous and uniformly dense intercellular substance between 

 the cells, as was formerly held to be the case before the exact 

 value of the facts above stated was recognised ; though 

 this is a view to which we shall again refer in our account 

 of the development of hyaline cartilage. It has not yet been 

 shown whether, in hyaline cartilage, an intervening material 

 different from the chondrin-yielding substance, and which, f if 

 present, would be in smaller quantity than the former, really 

 exists or not. 



The various parts of the embryonic skeleton are formed 

 from hyaline cartilage, whilst in adults it constitutes the 

 cartilages covering the articular ends of bone, and the opposed 

 surfaces of the symphyses, the ensiform process, the ribs, and 

 lastly, the bronchial, tracheal, and laryngeal cartilages, with the 

 exception of the epiglottis. In the lower Vertebrata, Fishes, 

 and Amphibia, considerable portions of the skeleton, which are 

 ossified in other animals, remain cartilaginous throughout life ; 

 whilst in some animals cartilages occur in parts which, in others, 

 and in man, consist only of connective tissue ; as, for instance, 

 the sclerotic coat in the eye of Birds, Amphibia, and Fishes. 

 In regard to the Invertebrata, descriptions have been given of 



* Virchow's Archiv, Band xix., p. 554. 

 t Wiener Sitzungsberichte, 1868, April. 



