Excerpt from Public Health Laboratory Work
The first edition of this book, while dealing mainly with chemical matter, contained a useful resume of public health bacteriological work, and this contribution was continued in subsequent editions; but it is felt that the time has now come to exclude all but occasional references to bacteriological matters, in order to keep the volume within the compass of a handy laboratory guide to the chemical branch of public health laboratory work; for the needs of the public health student in bacteriology are now fully provided for by several excellent laboratory works.
The book does not describe a large number of methods to the same end. It has always been the aim of the writer to simply and sufficiently describe selected processes which experience has proved to meet satisfactorily the requirements of the public health worker.
In the section on Food, while prominence is given to adulteration which raises the presumption of a danger to health, it has not been judged wise to exclude all reference to other matter; for the public health student is still required at some examination centres to show a knowledge of laboratory methods for the detection of sophistication which has no bearing on health, such as, for instance, the methods which serve to distinguish between butter-fat and other fats used as substitutes.
I have to acknowledge gratefully my indebtedness to Mr. F. Marchant for assistance rendered in the preparation of this new edition; and I have also to thank Messrs. Townson and Mercer, Messrs. Baird and Tatlock, and others, for the loan of blocks.
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