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FRANCIS H. HERRICK 



(Tanysiptera) of the East Indian and Australian forests have 

 a similar habit, while the fish-eaters, when they do not casually 

 adapt a natural cavity to conceal their eggs , tunnel the earthen 

 banks of the streams off which they feed; in all such cases the 

 methods of nest-building have to all appearances been influ- 

 enced by the food habits. 



The most elaborate nests of modern birds fall under what 

 is preeminently the constructive type of building {j, i, h), and 

 may be called Increment Nests, par excellence, because they are 

 made of separate pieces or increments, brought and laid in 



Figure 4 — On left, nest of black-throated green warbler, Dendroica virens, removed 

 from support; cup deep, perfectly molded, with overhanging brim; materials 

 various, yellow birch bark covering outer wall; rather elaborate increment 

 nest of statant type. 



Figure 5 — On right, nest and egg of magnolia warbler (see fig. 3), seen from above; 

 loosely modelled of nearly uniform materials throughout, with horsehair lining; 

 cup as perfect as in Fig. 4, but more shallow, and of different form. 



succession, often hundreds or thousands in number, of indeed 

 the most diverse kinds, though put together and treated in a 

 fairly definite manner, and, as we say, with great ingenuity, 

 deftness or art. 



Considered in the broadest sense, the increment nests are of 

 two kinds or types, based upon different methods of support 



