Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.
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An apology is needed for adding a new work on Sanitary Science to the long list of admirable volumes on that subject with which the past has dowered us. This little volume is intended primarily as a manual for students preparing for the D.P.H. examination, though it is hoped that it may also be useful to all sanitary officers and medical officers of the Public Services. The reason for its appearance lies in my own experiences. When preparing for the D.P.H. examination, I found, as I think most students find, that the ordinary manual, or Text-book, of Hygiene, does not carry one far enough. To refresh the Hydrostatics and Heat, other text-books on those subjects must be procured. Further books, again, will be required for the laboratory work in Water A nalysis, in Bacteriology, in Food Analysis ;also for the Parasitology, the Geology, etc., etc. Thus the student has to provide himself with, or gain access to, quite a library of volumes at considerable expense and trouble. I hope the present work will be found to obviate all these disadvantages, in that it aims at covering all the necessary ground. I have endeavoured to make it thoroughly practical, so that it shall be as useful and indispensable in the laboratory as it is in the study. My own D.P.H.
(Typographical errors above are due to OCR software and don't occur in the book.)
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