112 VEGETABLE HISTOLOGY. 



CALCIUM CARBONATE Occurs as incrustations or crystals; it is 

 soluble in acetic acid with evolution of gas (CO 2 ). 



PROTOPLASM OR PROTEIDS GENERALLY 



1. Yellow or brown by iodine solutions. 



2. Yellow by nitric acid ; on addition of potash or ammonia 



a bright yellow color is produced (xantho-proteic reac- 

 tion). 



3. Swell and lose details of structure on treatment with 



potash, ammonia or Labarraque's solution. 



4. Stain readily with carmine, haematoxylin, bright red with 



Hanstein's aniline-violet. 



5. Best stains for nucleus are hseinatoxylin, safranin and 



methyl-green. 



STARCH GRAINS 



1. Blue with solutions of iodine in presence of water. 



2. Swell in potash and in water above 65 C. 



3. Swell in dilute sulphuric acid. 



4. Swell and are colored blue with iodine in chloral hydrate. 



INULIN 



1. Soluble, but not readily, in cold water. 



2. Precipitated as sphere-crystals by alcohol or glycerin. 



3. Not colored by iodine, and soluble in potash. 



FIXED OILS 



1. Black with osmic acid. 



2. Saponified with potash ; soluble in ether. 



3. Pink with alcannin solution. 



RESIN 



1. Soluble in alcohol or ether. 



2. Red by alcannin solution and blue by Hanstein's aniline 



violet. 



TANNIN 



1. Deep brown by potassium dichromate or chromic acid. 



2. Greenish blue by ferric salts. 



