LIST OF ILLUSTRATIONS. 



Plate 1. Isobars and contours on water surface of Lake Erie, August 5, 1910. 



2. Nodal lines and depths in Lake Erie; barometric points around the Great 



Lakes. 



3. Relation of barometric change to rise of water. 



4. Wind effects, disturbed water surface, and currents. 



5. Nodal lines and depths in Lake Michigan. 



6. Nodal lines and depths in Lake Huron. 



7. Elevations of water surface, Lake Erie, June 1-July 15, 1910. 



8. Elevations of water surface, Lake Erie, July 15-August 28, 1910. 



9. Elevations of water surface, Lake Erie, August 28-October 11, 1910. 



10. Elevations of water surface, Lake Erie, October 11-31, 1910. 



11. Elevations of water surface, Lake Michigan-Huron, June 1-July 19, 1911. 



12. Elevations of water surface, Lake Michigan-Huron, July 15-August 28, 1911. 



13. Elevations of water surface, Lake Michigan-Huron, August 28-September 



30, 1911. 



14. Observed and corrected elevations of water surface, Buffalo, August 4-7, 



1910; barometric effects and wind effects. 



15. Observed and corrected elevations of water surface, Buffalo, October 21-22, 



1909; barometric effects and wind effects. 



16. Observed and corrected elevations of water surface, Buffalo, October 26-27, 



1910, and Cleveland, October 27, 1910; also barometric effects and 

 wind effects. 



