MARSH-WARBLER IN CAMBRIDGESHIRE. 41 



three or four following days, and at the end of a week 

 I again visited the copse, hoping to see these unfortunate 

 Marsh- Warblers settled in their new home. The nest 

 was so changed in appearance that at first I hardly 

 recognised it ; it was still empty and unlined, but was, 

 or appeared to be, considerably larger. A closer investiga- 



FIG. 3. DOUBLE NEST OF MARSH- WARBLER, 

 (Photographed by W. Farren.) 



tion showed that the birds had built a second complete 

 nest on top of the original one (Fig. 3). My explanation is 

 that they were stopped in their building by the rainy days, 

 and afterwards, instead of lining the original nest, had 

 continued to build. Not to prolong the story of these 

 truly unfortunate birds — Avhose misfortunes I felt that 



