434 



REPORT OF THE COMMISSIONERS OF 



HYGROMETRIC OBSERVATIONS AT THE MAINE STATE COLLEGE 

 AGRICULTURAL EXPERIMENT STATION. 



The agricultural experiment station of the Maine State College at Orono, Maine, 

 has kept a record of hygrometric conditions at two points in the open field and at two 

 points in a neighboring forest for the growing season, April to October, inclusive, for 

 a number of years. The following explanatory matter relating thereto is derived 

 from the Annual Reports of the Maine State College: 



Hygrometer No. I is placed in a wooden stand constructed for thermometrical 

 instruments, located in an open field remote from buildings. No. 2 is enclosed in a 

 wooden box, perforated to allow a free circulation of air, and also located in the open 

 field. No. 3 is enclosed in a perforated box attached to a tree in a moderately dense 

 forest. No. 4 is placed in a similar box attached to a tree in a portion of the forest a 

 little more open than that in which No. 3 is located, but near which is a running brook 

 except during the driest part of the summer. 



Each hygrometer is about four feet above the surface of the ground. 

 Readings are taken three times daily, at 7 A.M., 1 P.M. and 7 P.M., local time. 



Observations began April 5, 1889, and were continued through the growing 

 seasons of 1889, 1890, 1891 and 1892. 



The monthly averages are given in the following tables on the scale of 100. 



Hygrometer No. 1. In Open Field. 







1889 







1890 







1891 







1892 







MONTH 



























ME\N 





7 A.M. 



I P.M. 



7 P.M. 



7 A.M. 



1 P.M. 



7 P.M. 

 58 



7 A.M. 

 85 



I P.M. 



7 P.M. 



7 A.M. 



1 P.M. 



47 



7 P.M. 





April, .... 



8l 



53 



66 



74 



5° 



6l 



67 



74 



57 



64 



May, . 









84 



60 



7 1 



81 



62 



74 



82 



57 



67 



78 



63 



67 



71 



June, 









88 



67 



81 



83 



7 2 



75 



83 



62 



71 



86 



69 



74 



76 



J^y, • 









85 



65 



75 



&5 



74 



79 



87 



61 



72 



84 



57 



69 



74 



August, 









95 



70 



80 



90 



63 



77 



89 



67 



83 



92 



70 



80 



80 



September, 









93 



68 



83 



93 



76 



85 



92 



67 



84 



97 



61 



81 



82 



October, 









94 



66 



79 



90 



62 



79 



9O 



63 



80 



86 



64 



76 



77 



Means 



5 



89 



64 



76 



85 



66 



75 



87 



63 



75 



85 



62 



72 



75 



