COOLEY'S CYCLOPÆDIA OF PRACTICAL RECEIPTS AND COLLATERAL INFORMATION IN THE ARTS, MANUFACTURES, PROFESSIONS, AND TRADES INCLUDING Medicine, Pharmacy, Hygiene, and Domestic Economy DESIGNED AS A COMPREHENSIVE SUPPLEMENT TO THE PHARMACOPEIA AND GENERAL BOOK OF REFERENCE FOR THE MANUFACTURER, TRADESMAN, AMATEUR, AND PREFACE TO THE SEVENTH EDITION IN the preparation of the present edition of Cooley's Cyclopædia,' the object kept in view has been the revision and amplification of the matter originally contained in the work rather than the enlargement of its scope. The more important additions to the work will be found under Photography, Surveying, and Insects Injurious to Crops. The old article on Photography has been entirely re-written and greatly enlarged, and a collection of formulæ and processes from the very best authorities of the present day has been included in it, which it is hoped will prove useful, not only to the amateur, but also to the professional. Surveying appeared to demand a place in a book which is largely used by country gentlemen and colonists, and though the methods given are chiefly those used for military purposes, my own practical experience of the value of these methods for purely civil purposes, and the opportunity offered of reproducing the more important cuts and diagrams from Colonel Richards' work on Military Topography,' has led me to deal with the subject from this point of view at some length. The important new feature in this edition is the series of articles on Insects Injurious to Crops, which are practically a reprint of reports made by Mr Chas. Whitehead, F.Z.S., to the Agricultural Department of the Privy Council and to the Board of Agriculture. These articles are reproduced by special permission of the Board, "The Board being anxious to encourage the spread of agricultural information, and Mr Whitehead and the Controller of Her Majesty's Stationery Office having expressed to the Board that no objection would be taken to the publication," provided the same be duly acknowledged. In compliance with this request each article is formally acknowledged thus-Reports on Insects Injurious to Crops, by Chas. Whitehead, Esq., F.Z.S. The subject is one worthy of the closest attention by all agriculturists, and I would here express to Mr Chas. Whitehead and to the Board of Agriculture my most grateful thanks for the permission accorded. The revision of the Pharmacy, one of the most important divisions of the work, has been carried out very thoroughly by my friend, Mr. A. W. Gerrard, Pharmacist to University College Hospital. Great additions have been made, and nothing has been removed in any way likely to be of practical utility. The character of Cooley's Cyclopædia' as a pharmaceutical reference-book has always been considerable, and no effort has been spared to keep it well up to the mark in this respect. The general Chemistry has been most thoroughly revised by various hands, and brought well up to date. Special attention has been paid throughout to all commercial and practically useful methods and processes, whilst, at the same time, the scientific aspect of the various branches of the subject |
