CONTENTS 
XV 
Page 
Grade and grain of abrasive wheels. 432 
Selecting wheels.. 433 
Speed of rotating wheels. 434 
Abrasive papers. 435 
Preparing specimens. 437 
Etching.. 43P 
Etching liquids. 441 
APPENDIX. 
Table of melting points. 443 
Periodic system of the Elements. 446 
Preparation of special reagents. 447 
Synopsis of Course in Introductory Chemical Microscopy, Cornell University. 451 
Key to Materials used in Course. • . 461 
Key to Reagent Block, Michrochemical Analysis . 462 
Reference books.. . 463 
Index. 467 
