188 



FRANCIS H. HERRICK 



Hanging or suspended nests when due wholly to the efforts 

 of the builders, in what may possibly be regarded as their sim- 

 plest form {b, 2, a\ i) are attached to their support by one side 

 only, and often by the aid of viscous mud, saliva, or both. Under 

 this head would fall many of the swifts, swallows, as well as 

 certain hummingbirds which fix their diminutive nests to cliff's, 

 drooping leaves, or even to swaying tendrils and cords, in which 

 case the nest at times is even counteq^oised by the addition 

 of weights (see section 7). It is natural to find that here, as 



Figure 7 — Ujiper figure, nest of esculent swiulet, Cultoailtn indipUagn, soiled from 

 use; composed entirely of saliva; pendent tvpe, supported at side. (See 

 table 2, —2, ■a\ I.) 



Figure 8 — Lower figure, nest and eggs of American chimney swift, Chaetura pel- 

 agica; wholly of elm twigs, crossed and glued with saliva. 



well as in nests of the subordinate division {i-dii, a-), which 

 are more or less transitional in character, that a molded cup 

 form is present wherever the supports are sufficiently rigid to 

 permit of the molding movements and render them effective. 



More completely pendent nests (a\ it) are seen in the rather 

 stiff cups of the vireos in which the brim is suspended between 

 the slender forks of a twig. Although such cups are often very 



