n6 One Thousand Objects. 



980. STARCHES of all kinds, especially with large 

 granules, exhibit crosses. 



981. SALICINE CRYSTALS. An alkaloid obtained from 

 willow bark. 



982. QUININE CRYSTALS. An alkaloid obtained from 

 Peruvian bark. 



983. CHLORATE OF POTASH, a well-known chemical, 

 is with some a favourite object. 



984. ASPARAGINE. An alkaloid from the asparagus 

 plant. 



985. SULPHATE OF IRON, or green copperas, well 

 managed, furnishes beautiful crystals. 



986. SANTONINE. The chemical principle of worm- 

 seed. 



987. BENZOIC ACID. The sublimed crystals from 

 green benzoin, or Benjamin. 



988. BORACIC ACID. Derived from borax, which is 

 also employed as a polariscope object. 



989. PALMITIC ACID, derived from palm oil, if warmed 

 till the acid melts, will exhibit the phenomena of crystal- 

 lization as it cools. 



990. SULPHATE OF CADMIUM. A metallic sulphate, 

 often commended. 



991. SULPHATE OF MAGNESIA, or Epsom salts, and 

 also the heavy carbonate of magnesia. 



992. PHLORIDZINE. An alkaloid derived from the 

 roots of the apple-tree. 



993. OXALATE OF LIME, or oxalate of ammonia. 



994. LITHIC ACID and gallic acid may either of them 

 be used. 



995. CARBONATE OF LIME, under almost any form, 

 polarizes well. 



996. BICHROMATE OF POTASH. 



997. IODIDE OF POTASSIUM. 



998. CITRIC ACID or tartaric acid. 



999. Bl-TARTRATE OF AMMONIA. 



1000. SULPHATE OF NICKEL AND POTASH. A double 

 salt, of which several have been recommended for the 

 polariscope. 





