CONTENTS XV 



PAGE 



Grade and grain of abrasive wheels 432 



Selecting wheels 433 



Speed of rotating wheels 434 



Abrasive papers 436 



Preparing specimens 437 



Etching 439 



Etching liquids 441 



APPENDIX. 



Table of melting points 445 



Periodic system of the Elements 446 



Preparation of special reagents 447 



Synopsis of Course in Introductory Chemical Microscopy, Cornell University . 45 1 



Key to Materials used in Course 461 



Key to Reagent Block, Michrochemical Analysis 462 



Reference books 463 



INDEX . 467 



