256 



REPORT OF THE 



No. 3 



For the purpose of enumerating these species where they occur densely an arbi- 

 trary unit was evolved, based upon the maximum area of ground which can be 

 freed from stem and foliage in a single up-rooting operation. This was fixed 

 at about four square feet, and is, as these plants grow in that territory, a liberal 

 allowance. 1^ 



THE ENOINEERINQ SOCIETY. 



