Important changes in legislation, and a mounting number of court decisions relevant to the topics here discussed, have made a revision and expansion of the fourth edition necessary. The objective of the book still remains essentially as it was twenty-one years ago, when the first edition appeared. That aim is to present to engineers and engineering students a simple treatment of the legal aspects of engineering undertakings and responsibilities, using a minimum of technical legal terms and avoiding the subtler distinctions and conflicts. As legal problems now arise in a wide range of engineering activities, it has been thought well to add three more chapters. These concern "Mines, Oil and Gas Wells, and Pipe Lines"; "Public Utilities"; and "Public Health."

R. E. LAIDLAW, B.A.Sc., is Justice of the Court of Appeal for Ontario and ex-officio a Judge of the High Court of Justice for Ontario.

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C. R. YOUNG, B.A.Sc., C.E., D.Eng., D.esSc.A., LL.D., is Dean Emeritus of the Faculty of Applied Science and Engineering at the University of Toronto.

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A. R. DICK,B.A., is Barrister-at-Law at Osgoode Hall.

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