448 



MANIPULATION. 



microscopic objects for this purpose. Many of the subjects 

 contained therein, it will be noticed, have already been given 

 under diiFerent heads ; but, notwithstanding this, it has been 

 deemed the best plan to repeat them, that they may all be 

 arranged as objects for the polarizing microscope. They are 

 here, however, for the sake of convenience, divided into three 

 classes, viz., the animal, vegetable, and mineral : — 



Animal. 

 Bone of Cuttle-fish, 

 Fibres of Sponge, 

 Hoof of Ass, 



Camel, 



Horse, 



Ox, 



Sheep, 



Horn of African Rhinoceros, 



transverse section, 



vertical section, 



Indian Rhinoceros, 



Antelope, 



Ox, 



Sheep, 



QuUl of Porcupine, 



• — — Echidna, 



Condor, 



Tendon, Human, 



Ostrich, 



Grey Human Hair, 

 Raw Silk, 



Scale of Eel, 



Sole, 



Skin, Elephant, 



- Crocodile, 



- Human, 



- Rhinoceros, 

 Spicules of Gorgonia, 

 Wlialebone, 

 Palate of Whelk, 



Limpet, 



■ Nassa, 



Paludina, 



Cyclostoma, 



Wing cases of Beetles, Animal 



matter of 



Vegetable. 

 Starch, Potato, 



Arrowroot, 



Custard-powder, 



• Indian-corn, 



Tous les Mois, 



Gun-cotton, 



Hairs from Leaf of Deutzia, 



Elseagnus, 



Olive, 



Raw Cotton, 



- Flax, 



Siliceous Cuticle Bamboo, 



■ Equisetum, 



Rice, 



Wheat 



Agate, 



Brighton Pebble, 



Crystals of Acetate of Copper, 



Bichromate of Potash, 



Borax, 



Boracic Acid, 



Borate of Ammonia, 



Borax & Phosphoric Acid, 



Carbonate of Lime, 



Chromate of Potash, 



Chlorate of Potash, 



Cholesterine, 



Citric Acid, 



Epsom Salts, 



