100 JOURNAL OF FORESTRY 



same extent, though all the trees within the strip showed some injury. 



The several tree species were also differently afifected, Douglas fir, 

 western yellow pine, and lodgepole pine heing the most injured, in 

 some cases as high as 30 per cent of the stand of these species within 

 the belt being killed outright. Alpine fir, Engelmann spruce, and juni- 

 per were usually injured only to a slight extent. 



A peculiar efifect of the red-belt injury was the killing of mistletoe 

 on trees that were only slightly damaged and were capable of full re- 

 covery. Mistletoe-infected trees outside of the zone still have living 

 plants of the parasite. 



The red-belt injury is apparently due to excessive transpiration of 

 the needles during the periods of Chinook winds, especially when the 

 warm wind has been preceded by an extreme cold spell. This sup- 

 position is borne out by a study of weather records for the winter of 

 19 1 7- 1 8. The loss of water through the ([uickly thawed-out needles 

 cannot be replaced from the remainder of the tree, which continues in 

 the frozen condition for a greater length of time. This results in the 

 death of the needles and. if enough of the foliage is damaged, in the 

 death of the tree. 



A New Forest for the Yale School of Forestry- 



The Yale School of Forestry has recently received a gift of nearly 

 1,500 acres of forest in one area. It is the so-called Den forest, some 

 40 miles southwest of New Haven. It is a mixed hardwood forest 

 typical of southern Connecticut. .Vccompanying the gift of the land 

 are interest-bearing securities, the income of which will more than pay 

 the taxes ; also a fund to pay for a survey of the property. This survey 

 will be made as early as opportunity permits and a bulletin published 

 descriptive of it along the same lines as Bulletin Xo. 4 descriptive of 

 the Keene forest. 



As the Keene forest is coniferous in character, being chiefly white 

 pine, the addition of the Den forest, which is hardwood in character, 

 places the school in a strong position as to forest ownership. Improve- 

 ment on the Keene forest has progressed rapidly during the past year, 

 and cleanings made to free young stands of white pine from overstand- 

 ing gray birch and other hardwoods have netted the school more than 

 $1,000. Similar improvement work is now in progress. 



Two additional areas adjacent to the Swanzea tract, approximate! v 

 140 acres in area, have been purchased and two detached tracts located 

 some distance from the Swanzea area have been sold, it being the policy 



