INTEODUCTORY PREFACE. XI 



have carefully acliiiowleclged throughout, but with some differ- 

 ence in method. In the observations continued from the 

 First Edition the initials of the contributors are, as before, 

 appended, the names and addresses being given in the list at 

 pp. 399, 400. Again I have to express my thanks to Mr. 

 Malcolm Dunn, .of Dalkeith, who aided me in forming the 

 plan of the original volume, and with introductions especially 

 to Scottish Head Foresters, and Superintendent Gardeners, by 

 which I obtained much valuable information ; and I am also 

 much indebted to Mr. George Brown, of Watten Mains, 

 Caithness, N.B., for consultation and information as to agricul- 

 tural points, given me for the First Edition. 



In the case of the observations added in the present Edition, 

 I have (as in my Annual Reports) appended the name and 

 address of the observer to the information given. 



To all I beg to express my hearty thanks for their courtesy, 

 and for the kind as well as skilled aid afforded me in the 

 work, now for more than thirteen years, which aid has enabled 

 me to lay before my readers the views of many whose names 

 alone are enough to tell the value of their recommendations 

 regarding the best methods of dealing with some of our worst 

 crop pests. 



In the entomological part I acknowledge, with many thanks, 

 assistance, both personal and by his works, from my much- 

 valued friend. Prof. J. 0. Westwood, Life-President of the 

 Entomological Society of London ; and also, in the difficult 

 task of identification of the Diptera, from ]\Ir. Pi. H. Meade, 

 of Bradford. 



I am also greatly indebted for kind assistance in my work 

 to the official Entomologists of other countries, and, amongst 

 these, for the cordial help always given me by Mr. J. Fletcher, 

 Dominion Entomologist of Canada, and likewise by Mr. Frazer 

 S. Crawford, Inspector under the Vine, &c.. Protection Act in 

 South Australia. I should also acknowledge my obligations to 

 Prof. C. V. Riley, Entomologist of the Department of Agricul- 

 ture of the United States of America; to Dr. J. A. Lintner, 

 State Entomologist of New York State ; and likewise to Dr. J. 

 Ritzema Bos, Prof, at the State Agricultural College, Wagen- 

 ingen, Holland, for the valuable co-operation kindly accorded 



