ILLUSTRATIONS. 
Page. 
Fie; . 1 . Platinum-tipped crucible tongs 23 
2. Radiator for rapid and safe evaporation 24 
3. Chatard's form of drying oven for water determinations 37 
4. Penfield's tubes for water determination in minerals 39 
5. Penfield's fire brick and charcoal oven for use in determining water . . 40 
6. Tube for water determination according to Penfield 40 
7. Modified form of the Gooch tubulated platinum crucible for the deter- 
mination of water 42 
8. Details of Gooch crucible for determining water 43 
9. Arrangement during fusion of Gooch apparatus for determining water . 44 
1 0. Glass tube for determination of water ( Jannasch) 46 
11 . Glass tube for determination of water in special cases ( Jannasch) 46 
12. Apparatus for colorimetric determinations 70 
13. Cooke's apparatus for the determination of ferrous iron 93 
14. J. Lawrence Smith's crucible for alkali determinations 97 
15. Compact form of apparatus for estimation of carbon dioxide 102 
