THE LIBRARY. 99 



partitional survey ; and a plan or chart of each compart- 

 ment. The author details then all information embraced 

 in the studies of the school in xilometry : both that 

 relating to the cubic measurement of the wood, and that 

 measurement in regard to all the trees on the ground ; and 

 all the information embraced in the studies of the school in 

 regard to increase made by growth. He then treats of 

 secondary products, and of intrinsic conditions of the forest. 

 Treating in the second part of Ordenacion strictly so-called, 

 he specifies as preliminaries to be determined the formation 

 of circuits ; the kind of trees to be grown ; the exploitation 

 to be followed timber forest, coppice, or a combination, 

 of the two and the number of years to be preferred as 

 constituting the revolution or cycle of growth and repro- 

 duction. Next, under the head of Methodes de Ordenacion , 

 there are detailed the different methods of division of 

 forests in use that according to eqiial areas, or the 

 French Metkode a tire et aire ; that inversely proportional 

 to the condition of the crop ; areas inversely proportional 

 to the actual produce ; and what he calls the indirect 

 division. There are next discussed the methods of division 

 followed in Spain ; and there is given in detail, with 

 illustrative chart, the plan of Ordenacion adopted in the 

 forest ' La Herreria.' There are then passed in review the 

 methods of distribution proposed by Bekman, Ostellt, 

 Schilcher, Hennert, Wedel, J. L. Hartig, and E. Gotta. 

 There are next discussed what are designated the rational 

 methods of exploitation, summarised as: 1. Methods based 

 on average increase. 2. Methods based on the Austrian rates. 

 And 3. The harmonic methods. Under the head of Austrian 

 rates, a development of that of Hartig and Cotta, he 

 passes in review the views of Huber, advanced in 1812, and 

 those of Hundeshagen. 



Proceeding then to the subject of exploitation the author 

 discusses in succession the preparation of a general plan 

 of operations ; the preparation of a special plan for each 

 compartment; and the successive revisions to which this 

 should be submitted as exploitation advances, and new 



