Transcriber's Note
The following suspected errors have been changed in this text:
Page 6: "highdays" changed to "highways"
Page 11: "abbatoirs" changed to "abattoirs"
Page 11: Added missing "." to "Fig. 5."
Page 14: Added missing "." to "Fig. 10."
The following suspected errors have been changed in this text:
Page 6: "highdays" changed to "highways"
Page 11: "abbatoirs" changed to "abattoirs"
Page 11: Added missing "." to "Fig. 5."
Page 14: Added missing "." to "Fig. 10."