Transactions and year book 1921 . PUBLISHED BY THE SOCIETY THE TRANSACTIONS PREFACE THIS IS THE FIRST issue of theTRANSACTIONS since the birthof Applied Science as a monthlyin 1907. It is the first publication of theSociety since the last issue of AppliedScience in 1916. Therefore, if it doesnot meet the standard set by our pre-decessors may those who come afterprofit by our shortcomings, and remem-ber that all things have to have a start. Toronto, April 15 th, 1921. THE TRANSACTIONS

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