APPENDIX 

 I. The Metric System 



Length. 1 meter = 10 decimeters = 100 centimeters (100 cm.) 

 = 1000 millimeters (1000 mm.). 



1 decimeter = 10 centimeters = nearly 4 inches. 

 Volume. 1 liter = 1000 cubic centimeters (1000 c.c.) = a cube 

 10 cm. X 10 cm. X 10 cm. 



1 liter = 1.057 quarts (U. S.) or 1.136 quarts (Brit.). 

 1 fl. ounce (U. S.) = 29.57 c.c. 1 ounce (Brit.) = 28.4 c.c. 

 Weight. 1 gram (g.) = wt. of 1 c.c. of water at 4 C. 1 kilo- 

 gram = 1000 g. 



1 kilogram = 2.2 Ibs. avoird. (U. S. and Brit.). 

 1 ounce avoird. (U. S. and Brit.) = 28.35 g. 

 1 nickel (U. S.) weighs 5 g. 1 halfpenny (Brit.) weighs 5 to 

 5.7 g. 



H. Scale of Hardness 



Each of the following minerals ,<wijl ,scr^t6h* the surface of a 

 specimen of any one yrgceditpQ jt,ijn. tjie.list. -^ .- r , y -.. 

 1. Talc "/J. 6." , Felspar 



' 7r*'(JHSrii ' 



2. Gypsum ( 



3. Calcite (or Cu) ' "* >* '"^V topaz 



4. Fluorite -"' : 9. Corundum 



5. Apatite :*' * ^** -It). " Diamond 



Glass is sligntly scratched by 5, and easily by those following. 

 Glass will not scratch 5 distinctly, but will scratch those pre- 

 ceding 5. 



A good knife scratches 6 slightly, but not those following. 



A file will scratch 7, but not those following. 



557 



