ILLUSTRATIONS. 



PLATES. 



Page. 



I. Fig. 1. — Brown rat. Fig. 2. — Black rat Frontispiece. 



II. Fig. 1. — A cornfield devastated by brown rats. Fig. 2. — A single corn- 

 stalk ruined by brown rats 20 



III. Copy of quarterly report of the rats destroyed in Copenhagen, October, 



November, and December, 1907 52 



TEXT FIGURES. 



Fig. 1. Telephone wires gnawed by rats 28 



2. Method of baiting guillotine trap 42 



3. Barrel traps 44 



4. A Burmese trap 45 



7 



