Every wide-awake dairyman takes an interest in the subject of bacteriology as related to the various dairy problems.

Iowa dairymen have taken much interest in this subject owing largely to the fact that dairy papers, dairy columns in agricultural papers have, been discussing this subject in an intelligent manner. Then, too, several American publications, notably Conn¹ has given us an excellent summary of the work done in Europe and this country. The amount of original work in this line in the United States is comparatively small, most of it having been done by Prof. Conn in Connecticut We must rely almost entirely upon the investigations of Europeans, and foremost among the investigators in this line stands Storch² of Copenhagen. Along with him there are such investigators as Weigmann- Kiel,³ Adametz,⁴ Freudenreich,⁵ Duclaux, Greff,⁷ etc.