4 BULLETI]^ 1093, V. S. DEPARTMENT OF AGRICULTURE. 



OBSERVATIONS ON WIND DISPERSION. 



To determine the number of caterpillars blown upon this bog, 

 traps were located at points shown on the map (Fig.^ 1) and con- 

 tinuous observations taken during the period in which the l.arvse 



PASTURE 



Fig. 1. — Sketch map of Muddy Pond Bog, showing location of traps. 



were carried by the wind. Record was made of temperature, with 

 Draper self-recording thermometers, one at the bog level and an- 

 other at the top of the observation tower described later; and wind 



