44 



Each Siib-Suivejor kept an outline trace of his daily work on a piece of tracing 

 cloth, and also made notes of the nature of the soil and class of forests that he met 

 with. At the end of a few days, when suflBcient detail survey Jiad been completed, 

 he coloured up the portions and marked them with lines according to the fixed sym- 

 bols. This trace the Snb-Surveyor kept going until his work was done, and it was 

 examined at the saiue time as the topographical detail. Some differences of opinion 

 were found at the adjoining edp;es as regards nature of soil, more especially between 

 the ' medium ' and ' very dry ; ' but these were reconciled. 



On compiling the different Plane Table Sections into Standard Sheets, it was found 

 that laying colour on to the tracing cloth spoilt it and rendered it opaque. The plan 

 of drawing in the lines in their proper colour and direction was then adopted, and 

 was found to answer all purposes, whilst the tracing cloth was kei)t clear and 

 smooth." 



In recording the nature of forest growth and soils the 

 maps should be on a sufficiently large scale. Eor such work 

 great accuracy of topographical detail is not required, and 

 therefore existing maps or enlargements of them will usually 

 serve the purpose. 



VALUATION SURVEYS. 



When required : methods in use.— In many cases, when for 

 instance the possibility is expressed by area, a good de- 

 scription of the crop is all that is requisite. But when the 

 possihility is expressed by number of trees or by volume, as 

 in the regular and selection methods, an enumeration or 

 estimate of the number of trees is necessary. In the method 

 of successive fellings the enumeration must also be accompani- 

 ed by an estimate of the cubic contents of each tree, in order 

 to prescribe the principal fellings. In such cases the analysis 

 of the crop is not complete until the enumeration has been 

 carried out. 



The material in the standing crop may be ascertained 

 accurately by complete survey, that is to say, by counting 

 and measuring the individual trees over the whole area. Or 

 it may he estimated, more or less accurately as desired, by 

 counting, the stoclc on sample plots of known extent or on 

 lines of known width run through the crop ; after which, by 

 means of simple proportion, the number of trees in the whole 

 area can be deduced. 



Choice of a method.— The circumstances of each case must 

 decide which of these methods should be adopted. Obvious- 

 Iv the most correct is to count and measure each tree in the 



