VI PREFACE TO THIRD EDITION 



is obviously a mere modification, yet in the bulletin "Provi- 

 sional Methods of Food Analysis," issued by the U. S. Depart- 

 ment of Agriculture, the former method is given as if it were 

 original with Gerber, but the authors of that bulletin cannot 

 be unaware of the facts of the case. 



Philadelphia, June, 19015 



