INDEX 



489 



Wiesner, theory of protoplasmic 

 structure, 250. 



Willows, variation in stamens of 

 (illus.), 160. 



Wilson, E. B., 125, 126, 279. 



Wing hooks of honeybee (illus.), 

 155. 



Wings of a drone honeybee, show- 

 ing variation (illus.), 155; (il- 

 lus.), 156; of animals, analogies 

 in, 173; variation in pattern of, 

 in Peronea cristana, 148. 



Winthemia 4-puxtulata (illus.), 348. 



Woodpecker, California, acorns de- 



posited in tree by (illus.), 432; 



(illus.), 434. 

 Worms, parasitic, 354. 

 Wyman, J., 461. 



Xerophyttum simile (illus.), 409. 

 Youatt, 80. 



Zebra, hybrid of, with horse, 183. 



Zirphcea crispata (illus.), 39. 



Zoogeography, 309. 



Zoya, 279. 



Zur Strassen, O., 279. 



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