20 



TALPID^— TALPA 



Fig. 3.— Plan of Tunnels of „ ^ „ 



SIMPLE FORTRESS. See also Fig. 4.-SECT10N of Simple Fortress, plan of 



Fig. 4. 



which is shown in Fig. 3. 



4 I. 



5. 7. 



Fig. 5.— Plan of Complicated Fortress, Fig. 6.— Plan of Complicated Fortress, 

 WITH Eleven Exits. with several Blind Terminals. See 



also Fig. 12. 



t. 



h. 



Fig. 7.— Section of Fortress on Marshy 

 Ground, with Old (Ni) and New (N2) Fig. 8.— Plan of Fortress shown 

 Nests. See also Fig. 8, in fig. 7 



