HEYER'S METHOD. 327 



The method does not claim to be theoretically quite correct, 

 because it does not accurately define the extent to which the 

 growing stock of marketable material may be reduced, or ought 

 to be increased, but it is correct enough wherever large areas 

 have to be dealt with in a short time. It works expeditiously, 

 and prevents a deterioration of the forest, if judiciously applied. 

 Had it not been for this method, the valuable teak forests of 

 Lower Burma might have been exhausted, before their sus- 

 tained }deld capacity had been ascertained. It is a method to 

 be strongly recommended for adoption in countries where 

 systematic forest administration is in its earlier stages. 



SECTION IV. REGULATION OF THE YIELD ACCORDING TO IN- 

 CREMENT AND GROWING STOCK, COMBINED WITH THE 

 ALLOTMENT OF AREAS TO THE SEVERAL PERIODS OF 

 A ROTATION. 



This method was originally elaborated by Carl Heyer, and 

 classed under Section III., as it rested on the Austrian 

 method. Subsequently it was further developed, especially 

 by Gustav Heyer, until it became the combination indicated 

 in the above heading : it is generally known as " Heyer's 

 method." 



1. Principle of the Method. 



The principle of Heyer's method is as follows : 



(a) To arrange all woods into a general working plan 

 according to periods, so that each period contains the 

 same, or approximately the same,, area. The object 

 of this arrangement is, to prevent loss of increment 

 during the second and subsequent rotations. 



(fe) To equalize the real and normal growing stock, if any 

 difference should exist, in such manner and within 

 such time as may be indicated in each case and 

 approved by the owner. 



(c) To utilize the real increment, calculating the mean for a 



