xvi LIST OF ILLUSTRATIONS 



FIG. PAGE 



67. Rabbits and Cultivation, correspondence between increase of agricultural activity 



and of number of skins of Rabbits on sale at Dumfries Fur Fair (diagram) . 390 



68. Zebra Mussels from a mass of some 90 tons removed from a water-main at 

 Hampton-on-Thames (Brit. Mus. Econ. Pamph., The Biology of Waterworks, 

 i9'7. P- 25) 4'5 



69. Some alien Cockroaches introduced into Scotland 437 



70. Hessian Fly and seed-like puparia, in which form it was probably introduced 



to Britain 439 



71. Granary Weevil and destroyed wheat . . 441 



72. Piece of Dog Biscuit perforated by Biscuit Beetles (Trans. High. Agr. Soc., 

 1917, p. 151) v 444 



73. Beans and Peas damaged by larvae of Bean and Pea Beetles ( Trans. High. Agr. 

 Soc., I9f4, p. 180) . . . ,'.-. 446 



74. Bean Beetle (Trans. High. Agr. Soc., 1914, p. 180) . ' . . . .446 



75. Snowy Tree Cockroach frequently imported with bananas ' . .' . . 448 



76. Branch of Apple Tree covered with Apple Mussel Scale ( Trans. High. Agr. 

 Soc., 1917, p. 138) 449 



77. Section of damaged apple showing larva of Codlin Moth .... 452 



78. Codlin Moth 452 



79. Douglas Fir Seed Chalcid . . . - . . . . . . 454 



80. Douglas Fir Seeds from Peeblesshire showing escape holes of the parasitic 

 Chalcid 455 



8t. Steel-BlueWood-Wasp(^>^^^Vw),male(7Vaj.^z^.^/-.^^.,i9i7,p. 134) 4 68 



82. Steel-Blue Wood- Wasp (Sirex noctilio), female (Trans. High. Agr. Soc., 1917, 



P- 134) 468 



83. Steel-Blue Wood-Wasp eating its way out of a pine stem after emerging from 

 pupa stage (Trans. High. Agr. Soc., 1917, p. 134) 468 



84. Timberman Beetles, imported to Aberdeenshire in Norwegian pine logs . . 471 



85. Some chance introductions to Great Britain (diagram) 473 



86. Comparison of surface features of Scotland, before the arrival of man and at the 

 present day (diagram) ........... 484 



87. Comparison between the livestock carried by 1000 acres of cultivated and un- 

 cultivated land (diagram) . . . . . . . . . . 495 



88. Alteration of moorland by Gulls, West Linton 503 



89. Near view of the same moorland ......... 503 



90. Representation of Recoils on man's health, due to different types of his inter- 

 ference with animal life (diagram) . , . 513 



MAPS 



I. Introduction and spread of the Capercaillie in Scotland . . to face p. 272 



II. Distribution of the Mountain Hare in Scotland .... ,, 282 



III. The Spread of the Common Squirrel in Scotland from various centres ,, 292 



IV. Distribution of Scottish " bloomeries " and slag furnaces . . ,, 320 

 V. Decline of Red Deer distribution at different periods . . ,, 334 



VI. Influence of man-made obstructions on Scottish Salmon Fisheries ,, 380 



VII. River pollution and fisheries ,, 384 



VIII. Distribution of Ague or Malaria in Scotland in the eighteenth century 508 



