XIV FUMIGATION METHODS 



nurseries and orchards the demand for exact informa- 

 tion about a cheap and reliable remedy became a live 

 topic. Little or nothing had been done with hydro- 

 cyanic acid gas fumigation outside of California. 

 From what the writer had observed in California, he 

 was certain that this method w r as the most promising 

 and would meet the conditions in the Hast and other 

 places if properly adapted. Hundreds of experiments 

 and practical applications were made by the writer to 

 test the gas in orchards, nurseries, greenhouses, mills, 

 warehouses, granaries, and various other places. The 

 outcome of these tests proved conclusively that hydro- 

 cyanic acid gas was a cheap and reliable remedy for a 

 very large range of insects usually found in such places. 



In the present volume the writer has attempted to 

 embody the practical results of his own experiences as 

 well as those of others who have used these gases suc- 

 cessfully. In his endeavors to gather together the 

 fragmentary notes, scattered as they were in litera- 

 ture throughout the world, the author feels that this 

 work is not complete and perfect in every respect. It 

 embraces, however, for the first time in one volume, 

 a general survey of this important and timely subject. 



Where the writer has not given personal credit in 

 the text he wishes to extend the same courteous 

 acknowledgment to all who have in any way con- 

 tributed to the contents of this volume. Hspecial 

 thanks are due to Mr. D. W. Coquillett for reading 

 and correcting proofs, and to Mr. Herbert Myrick, 

 Editor and Proprietor of the Orange Judd weeklies and 

 books, through whose aid and courtesy this volume is 

 written and published. 



