

167 



CHLORINE. CI. 



9. HTDRATB. C1 6 H 8 0. 



a. Preserved in a hermetically sealed tube. 

 Note. This specimen was prepared and presented by Dr. A. Senier. 



10. PERCHLORIC ACID. HC10 4 . 



t a. Dilate acid. 



BROMINE. Br. 



11. BROMINE. 



a. Commercial specimen. 



IODINE. I. 



12. KELP. 



a. Seaweed ash. 



6. Ditto, prepared in Ireland. 



13. IODINE. 



a. Crude iodine, prepared in Scotland. 



b. Ditto, prepared in Chili. 



c. Resublimed in crystals. 



14. IODIC ACID. H I 4 . 



t a- In crystals 



FLUORINE. F. 



15. SILICO- FLUORIC ACID. 4HFSiF 4 . (Hydro-fluosiUcic Acid.) 



a. Aqueous solution. 



SULPHUR. S. 



16. CRYSTALLINE. 



a. Native sulphur in crystals. 



Note. This variety is of frequent occurrence in collections of Indian 

 drugs. 



6. Crystals obtained by sublimation. (Pseudomorpfiic 

 Sulphur.) 



Note. When first prepared these crystals were translucent ; their 

 opacity is due to their becoming split up internally into minute crystals, 

 which have the crystalline form of specimen a. 



17. AMORPHOUS. 



a. Crude sulphur. 



Note. This specimen consists of native sulphur partially purified by 

 fusion. 



b. Sulphur condensed on alum heaps during the com- 



bustion of alum shale. 



Note. For alum shale see the central cote containing the mineral-; of 

 the alkaline metals and of the alkaline earths. 



