Wings, 119, 120, 631, 635, 

 636, 645, 647, 648, 662, 

 665, 672, 675, 678, 692, 

 696, 717. See also Flight, 

 Locomotion. 



in aphids, 123 

 Winter, aggregations, 97, 104, 

 106, 398, 487, 537, 538. 

 See also Hibernation. 



food, 707 



forms. See Cyclomorphosis. 



killing, 99-102, 104, 179 



mortality of fish popula- 

 tions, 334 



rain, regions of, 80 



residents, 122, 540 



season, 487, 502, 530, 531, 

 532, 533, 535-539, 561, 

 562 

 Wisconsin lakes, 504, 520, 



521, 526 



SUBJECT INDEX 



Wisent, 399, 400 



Witch hazel, 703 



Wolves, 604, 706, 707 



Woodborers, 491, 665 



Woodeaters, 423, 665, 712, 

 713, 714, 716, 717, 718 



Woodlands, mesic, 697 



Work summation, tempera- 

 ture and, 113 



Worms, calcium and survival 

 of, 361 



Wright, A. H., 52 



Wright, Sewall, 649 



Xerocoles, 184, 652. See 

 also Deserts, Moisture, 

 Water. 



Xerophytes, 184 



Yeast, 307, 309, 316, 817, 



326, 327, 602, 657, 712 

 Yellow fever, 28, 696, 724 



837 



Yosemite, California, life 



zones, 115, 116 

 Yucca— yucca moth relations, 



250, 486, 518, 685 



Zacharias, 42 

 Zebra, 589 



Zero, ecological temperature, 

 107, 108, 110 

 temperature, 74 

 Zoogeography, 54, 78, 597, 

 608, 629, 641, 659, 660, 

 661, 662, 666, 669, 718, 

 723. See also Distribution, 

 Geography. 

 Zooplankton, marine produc- 

 tivity, 520, 521 

 vertical migration, 555 

 vertical distribution, in 

 lakes, 446, 447 

 in sea, 450 

 Zschokke, 42 



