108 CRUENTINE. 



duced by process 6, to be almost equal to tlie original 

 substance from which it was produced by artificial 

 digestion. 



Connective tissue. 1. Boil connective tissue with 

 water. It will swell up and at last dissolve. The 

 filtered solution will have the properties of a solution 

 of gelatine (q. v.). 



2. Treat with acetic acid ; it will swell up and be- 

 come transparent. Add water and boil. It will 

 dissolve. To the solution add potassium ferrocyanide. 

 No precipitate will ensue. 



Corpora lutea. See Ovario-luteine. 



Cruentine. 1. Boil the blood-corpuscles, purified as 

 in the preparation of hsematine, with sulphuric acid. 

 The brown-red flakes of cruentine which form in the 

 liquid jnust be washed with water till neutral. 



2. Dissolve the flakes in sulphuric acid. The spec- 

 trum will show three bands. 



AaBCD EbF G HH 



Spectrum of sulphate of cruentine. 



3. Treat a portion of the dried flakes with ether or 

 chloroform. The red chloroform solution has a spec- 

 trum of four bands and a powerful rose-red fluoresence. 



