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 was the most promising 
and would meet the conditions in the East 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. Especial 
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. 
