PROTEIN IN PLANTS AND ANIMALS 25 



water before cooking or to boil it at once to prevent losses. 

 Take the white of egg and cook it in boiling water and note the 

 result. Chop up some meat and extract it with about a 10 per 

 cent, solution of common salt and boil the extract. Are there 

 any more albuminoids extracted in this way than with cold 

 water? Boil some fresh bones and obtain gelatine. Try to 

 treat some wheat grain by extracting the starch with cold water 

 and obtain a sticky mass which contains the gluten of the grain. 



