THE LIP.KARY. '.C 



suffice the operator in ascertain ing, with proximate 

 accuracy, such average measurements as will afford satis- 

 factory data for estimating the measurements of the 

 remainder. 



In the work under consideration the first chapter is 

 devoted to a description of the structure and application 

 of dendrometric instruments ; and under successive head- 

 ings are described: 1. Instruments for the measurement 

 of circumferences and diameters. 2. Means of determining 

 heights of trees. 3. Various dendrometers. 4 Trigono- 

 metrical measurements of heights and diameters. 5. 

 Instruments for measuring the increase made by growth. 

 G. Instruments employed in the measuring of timber, and 

 in determining the power of resistance and density of 

 woods. 



The second chapter relates to instruments employed in 

 determiningthe measurements and the increase by growth of 

 single trees; and under successive headings are described : 

 1. The typical measurements made. 2. The determination 

 of the cubic measurement of single bolls. 3. The deter- 

 mination of the cubic measurement of a standing tree. 

 4 The determination of the cubic measurements of stump, 

 branches, and bark. 5. The determination of the increase 

 made by growth. 



The third chapter is occupied with discussions 

 relative to trees, and the increase made by them in 

 woods. Under successive headings are discussed: 

 1. The density of the growth of trees in a forest, and 

 corresponding classifications of them on this ground. 2. 

 The determination of the number of trees in a foiest by 

 different methods enumeration and otherwise ; the 

 formation of classes, according to height and bulk; the 

 selection of the number of typical trees for each class, 

 concluding with observations and formulas relative to the 

 selection of type trees. 3. The increase made by growth, 

 and the determination of periods in which this varies by 

 increase or diminution. 4. The construction of tables, 

 including the calculation of co-efficients, and methods of 



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