282 Forestry Quarterly. 



other a sandy, well drained and often dry upland. The usual 

 explanation is that such plants are naturally adapted to the drier 

 site, that they can grow in a bog because of the retarded absorp- 

 tion owing to the acidity of the soil water, that the two habitats 

 are essentially alike so far as nutrition is concerned, both being dry 

 in terms of avilable water. The author found by experiment in 

 the case of the swamp blueberry (Vaccinium corymbosum) that 

 no amount of dryness in an upland soil will make it flourish if 

 that soil is not acid. It occupies both situations because the soil 

 of both is acid and only in such soil does it produce vigorous 

 growth. 



C. D. H. 



Surface Conditions and Stream Flow. By Wm. L. Hall and 

 Hu Maxwell. U. S. Department of Agriculture, Forest Service 

 Circular 176. 



Although this very important contribution to the subject which 

 its title indicates, is dated as issued January 11, 1910, it apparently 

 has been allowed to reach the public only long after its date of 

 issue. This curious time discrepancy reminds us that we had seen 

 the title once before, and we recall the contents as having figured 

 as Senate Document No. 676 about a year ago, and this again 

 reminds us that it was quoted and at least to the satisfaction of 

 the author controverted in its conclusions in the noted, if not 

 notorious, contribution to the literature on the influence of forests 

 on climate and on floods, perpetrated by WilHs L. Moore (see F. 

 Q. Vol. VIII, p. 74). The latter publication was perhaps mainly 

 inspired by the former, and was to serve as an argument against 

 the Appalachian Forest Reserve proposition. We expressed our- 

 selves at the time sufficiently strongly on Mr. Moore's untenable 

 attitude, and a number of other champions have demolished his 

 argument in general, whatever there may be left of it in par- 

 ticular. 



Again we come to the conclusion that there is, as yet, nothing 

 definitely or conclusively proved as to the final efifect of forest 

 cover on floods, but that nevertheless our natural philosophy can- 

 not escape the conviction that such influence exists and what it 

 must be. 



As the authors point out, if neither increased precipitation nor 



