oA. 
Subsequent reinfestation, based-on the difference in volume losses 
between 1932 and 1933, was reduced from 23 to 75 percent, also depend- 
ing up;on the temperatures within the area and upon the degree of the 
infestation. 
Although the freeze was very effective and widespread, its effect 
was found to oe only temporary. .The quick return during the summer to 
near epidemic conditions in some areas where overwintering broods had 
been extremely hard hit. showed that the effect cf the freeze did not 
extend much beyond the emergence of. the overwintering generation. This 
was reflected in the difference between beetle mortality and subsequent 
reinfestation on all areas examined, 
wat anti nat tot Rae etc el eran cee ey mere ct is Rs Nas Nee 
Keen, Portland, reports that the first aac of an interesting control 
experiment has just been compicted on the Ochoco National Forest, where 
a 40, 000-acre isolated tract of oonderosa »ine on the Maury Mountain 
di stietst las been covered with control beniedgynas and 5,500 trees in- 
fested with the western pine beetle have been cut, peeled, and burned. 
The pine forests on Maury Mountain are separated Sa the main forest 
belt by 7 miles of open sayebrush country, and it will be interesting 
to see if the control is more effective than on other tracts of the 
Ochoeo Netional Forest where the control areas are contiguous to un- 
treated infested forests. The clean- -U) Campaign was conducted by the 
Forest Service as a public werks project. 
Control of western pine Deetle attempted on isolated tract.--F. P. 
The protection of fire-killed Douylas fir.--J. M. Whiteside, 
Portland, writes: "The first intensive examination to determine the 
results of a series of tree-medicatiun tests on fire-killed Douglas 
fir has been made. Owing to a cessation of the physiological activ- 
ities of trees at this season, the absorption cf the solution has been 
very slow and very irregular, in both green and burned trees. In one 
of the green trees a very narrow streak of the sapwood has been stained 
16 feet above the point of injection, while in the other trees the solu- 
tion has reached an average height of only 4. feet. It is possible that 
the solutions will rise to a greater height during the ,resent mild 
weather 
Control of mound-building ants.--H. J. MucAloney, of the New 
Haven, Conn., field laboratory, and N. W. Hosley, Harvard Forest, Mass., 
have recently prepared for publication a payer on Experiments in Sim- 
plified Control of Mound-Building sats (Formica exsectoides Forel) in 
the Forest. Carbon disulphide and ethylene dichloride are effective, 
if used at times when most of the ants are in the mounds, as in the 
autuimafter seasonal activity has ceased and the ants are in hiberna- 
tion, or in the Ss .ring qr summer during periods of high relative 
humidity and low atmospheric »ressure. The most satisfactory method 

