LIST OF PLATES. 



Plates To face page 



XXJX-XXX. Timberlake on Hydrodictyon . . 520, 522 



XXXI-XXXVIII. JoliDson on Axial Bifurcation in Snakes . 538 



XXXIX-XLII. Downes on the Economic and Social Develop- 

 ment of Kenosha County . . 548,558,560,562 



XLIII. Regan on the Economic and Social Develop- 

 ment of LaFayette County . . . 584 



