CHONDRINE. 105 



9. Add sulphuric, hydrochloric, nitric, or phosphoric 

 acid, a precipitate will at first form, but will redissolve 

 in excess of the acid. 



10. Add arsenic, oxalic, acetic, tartaric, citric, or 

 lactic acid, or carbonic acid water ; a precipitate will 

 fall, insoluble in excess of acid. 



11. Add solution of ferrous sulphate, ferric chloride, 

 alum, cupric sulphate, mercurous or mercuric nitrate ; 

 a white precipitate is formed in each case. 



12. Add solution of potassium ferrocyanide, or 

 mercuric chloride. No precipitate will be produced. 



13. Drop a piece of dry chondrine into strong 

 nitric acid and boil. It will turn yellow and finally 

 dissolve. 



Chyle. 1 . Collect some white chyle from the chyle 

 vessels of the intestine of a freshly killed animal by means 

 of finely drawn out glass tubes containing rarefied air. 

 Observe that the chyle coagulates after some minutes 

 or hours, and can be isolated from the tube as a white 

 cylinder of solid matter. 



2. Collect some chyle by means of a repetition of 

 this process in a small vessel. Keep this covered to 

 prevent evaporation ; observe that the chyle coagulates 

 and on standing separates into white fibrine, and into 

 a white turbid serum, of strongly alkaline reaction. 



3. Collect chyle from the thoracic duct by means of 

 a suction syringe, or from living animals by a canula 

 inserted by means of a skilful operation. 



4. Observe microscopically that it contains white and 

 red blood-corpuscles and/& granules. 



