ALBUMEN. 63 



portion of the red solution add hydrochloric acid. It 

 will turn light yellow. 



10. Add silver nitrate solution. If the sodium 

 acetate solution is concentrated, a white precipitate of 

 silver acetate will ensue. If both solutions are dilute 

 no change will be observed even on boiling. 



11. Evaporate the sodium acetate solution to dryness. 

 Heat a portion with alcohol and sulphuric acid. Acetic 

 ether will be formed and recognised by its peculiar 

 and agreeable odour. 



Albumen, or white of egg. 1. Break a fresh hen's 

 egg, separate off the yelk and chalazae; dilute the 

 white with three or four times its bulk of water, filter, 

 and use the clear liquid for the following experiments. 



2. Place a portion in a test-tube, insert a thermo- 

 meter, and warm gently in a water bath ; at 66 0. the 

 solution will become opalescent, and about 80 0. the 

 albumen will coagulate, and be precipitated in white 

 flakes, which do not dissolve on boiling. 



3. Add a little nitric acid; the albumen will be 

 precipitated white. 



4. Add an excess of strong alcohol ; the albumen is 

 precipitated. 



5. Add a solution of corrosive sublimate, and observe 

 that an insoluble compound of the salt and albumen is 

 precipitated. Upon this reaction is based the use of 

 white of egg as an antidote in cases of poisoning by 

 corrosive sublimate. 



6. Acidify a portion of the albumen solution with 

 acetic acid, and observe that no precipitate is produced. 



