156 



MAINE STATE COLLEGE. 



Hygrometer No. 1 is placed in a wooden stand constructed for 

 thermometrical instruments and located in the open field remote 

 from buildings. Hygrometer No. 2 also is enclosed in a wooden 

 box, perforated to allow a free circulation of air, and located also 

 in the open field. Hygrometer No. 3 is also enclosed in a per- 

 forated box attached to a tree in a moderately dense forest. 

 Hygrometer 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., at 1 

 P. M., and at 7 P. M., local time. 



Observations were commenced April 5, 18S9 and they have 

 been continued through the growing seasons of 1889, 1890, and 

 1891. 



The monthly averages are given in the following tables on the 

 scale of 100. 



Percentages of Moisture, 

 hygrometer no. 1. — in open field. 



1SS9. 1890. 1801. 





7 A.M. 



1 P.M. 



7 P.M. 



7 A.M. 



1 P.M. 



7 P.M. 



7 A.M. 



1 P.M. 



7 P.M. 



Mean 



April, 



81 



53 



66 



74 



50 



58 



85 



61 



07 



00 



May, 



84 



60 



71 



81 



62 



74 



82 



57 



07 



71 



June, 



88 



07 



SI 



83 



72 



75 



83 



62 



71 



70 



July, 



S5 



65 



75 



85 



74 



79 



S7 



01 



72 



70 



August, 



95 



70 



SO 



90 



63 



77 



89 



07 



S3 



79 



September, 



93 



08 



83 



93 



76 



85 



92 



07 



84 



82 



October, 



94 



66 



79 



90 



62 



79 



90 



03 



80 



78 



Mean results, 89 04 70 85 



00 



87 



63 



70 



HYGROMETER NO. 2. — IN OPEN FIELD. 



1889. 1S90. 1S91. 





7 a.m. 



1 P.M. 



7 P.M. 



7 A.M. 



IP .M. 



7 P.M. 



7 A.M. 



1 P.M. 



7 P.M. 



Mean 



April, 



78 



52 



65 



70 



46 



56 



84 



. 62 



70 



05 



May, 



SO 



53 



68 



78 



61 



74 



80 



55 



68 



OS 



June, 



84 



66 



74 



78 



68 



75 



82 



62 



73 



73 



July, 



79 



60 



69 



80 



63 



71 



86 



62 



75 



72 



August, 



87 



67 



75 



88 



62 



73 



87 



65 



80 



70 



September, 



91 



60 



81 



91 



67 



83 



91 



67 



85 



SO 



October, 



93 



66 



81 



91 



62 



79 



91 



65 



82 



79 



Mean results, 85 61 



72 



82 



61 73 



86 63 



70 



Ti 



