02 



GENERAL ANATOMY OF THE TISSUES. 



they swell a little, are not affected ; if boiled for a whole day, 

 however, they are gradually dissolved : nitric acid colours them 

 yellow ; Millon's test for protein tinges them red ; whilst sul- 

 phuric acid and sugar have no action (red coloration) upon 



them. In a moderately diluted solution of potass, elastic tissue 

 remains, for a long time, unaltered in the cold, except that it 

 swells up and becomes somewhat paler. Heated for a day with 

 it, it becomes converted into a gelatinous mass. In water this 

 tissue does not alter, even after sixty hours' boiling, but 

 changes by boiling for thirty hours in Papin's digester into a 

 brownish substance, smelling like glue, but not gelatinizing, 

 which is precipitated by tannic acid, tincture of iodine, and 

 corrosive sublimate, but not by the other tests for chondrin. 



Fig. 23. Two secondary bundles of connective tissue from the arachnoid of man, 

 with coiled and straight (interstitial) fine elastic fibres, x 350, and acetic acid added. 



Fig. 24. Network of fine elastic fibre from the peritoneum of a child, x 350. 



Fig. 25. Elastic membrane from the tunica media of the carotid of the horse, 

 x350. 



