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Linen Fibres

Cotton fibres

Silk Fibre.

Wool Fibre.

Particle of Frather

Hemp Frère

Pus Corpuscles
treated with Actu Acid)

Human Bod dosidonys) de fcrenatıda
Corpuscles

farming a rouleau

Pus Corpuscles

Human Hair

Particles of Soot

(in au)

Crystals of Sodium Chloride

(in aur)

Gurunaru

Fular

Antenna of insects

Amaba

Scalas of fash.

Objects commonly found in impure water (and air).

LABORATORY WORK

BY

HENRY R. KENWOOD, M.B.

D.P.H.,

F.C.S.
INSTRUCTOR IN THE HYGIENIC LABORATORY, UNIVERSITY COLLEGE, AND ASSIS-
TANT TO PROFESSOR CORFIELD IN THE PUBLIC HEALTH DEPARTMENT,

UNIVERSITY COLLEGE; LATE ASSISTANT EXAMINER IN
HYGIENE IN THE SCIENCE AND ART DEPART-

MENT, SOUTH KENSINGTON, ETC.

INCLUDING

METHODS EMPLOYED IN BACTERIOLOGICAL RESEARCH, WITH SPECIAL

REFERENCE TO THE EXAMINATION OF AIR, WATER AND FOOD

CONTRIBUTED BY

RUBERT BOYCE, M.B.
ASSISTANT PROFESSOR OF PATHOLOGY, UNIVERSITY COLLEGE

WITH ILLUSTRATIONS

PHILADELPHIA
P. BLAKISTON, SON & Co.
No. 1012 WALNUT STREET

1893
AP

25 137 1893

PREFACE.

1

The matter contained within these pages is broadly that which is taught, under the direction of Professor Corfield, in the Practical Hygiene Course at University College. It is hoped that the book will prove of value to those interested in Public Health, and to those seeking Public Health degrees, and that it may be read along with the many excellent works upon Hygiene and Public Health which are now in circulation, but which of necessity deal with the subject of hygienic analyses in far too cursory a manner.

An effort has been made to convey to the reader, in a concise and practical form, the knowledge necessary to enable him to make those analyses which may be fairly considered to be included within the domains of practical hygiene. To treat the subject exhaustively would necessitate a very bulky volume, and those who recognise the breadth of subject matter embraced by the title “ Public Health Laboratory Work," will appreciate that it has been found necessary, in the present volume, to avoid all discursive matter save what is required to make the rationale of a process evident, and where there are several processes in vogue to one common end, to select that one which experience has taught to be at the same time the most simple, ready and efficient to the exclusion of all others.

It has not been an easy task, in every case, to decide as to what should be included and what omitted.

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There are, for instance, several recent and somewhat improved methods of estimating the carbonic acid in air, but the process of Pettenkofer has become what one may term “classical,” and is that which is still generally asked in Public Health Examinations; and since the method is sufficiently accurate, when carefully performed, for all practical purposes, it was thought advisable to introduce it to the exclusion of others.

The subject of hygienic analysis will be seen to dovetail itself into the work of the Public Analyst, but not to such an extent, it is held, as to render that officer any the less essential to a district.

The writer acknowledges his great indebtedness to the useful contribution on bacteriological methods by Dr. Boyce, for he recognises how much this enhances the value of the work; he desires also to express his thanks for many kind and valuable suggestions from Professor Corfield, Dr. Louis C. Parkes and Dr. Braga.

He is further indebted to Dr. Louis C. Parkes for the use of figures 51, 52, 55, 58, 60 to 67, 69 to 74, 81, 82, 84, 88, 89, 90, taken from his “ Hygiene and Public

, Health.”

H. R. K.

University College, W.C.

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