16 



stumpage values, circular letters and schedules to be filled out 

 have been sent to the lumbermen and dealers in different sections 

 of the State. 



TECHNOLOGICAL WORK. 



During the past summer measurements were made by this 

 office looking towards the construction of a yield table for white 

 pine. A yield table is one which shows the amount of wood per 

 acre that one can expect to obtain from pure even-aged stands of 

 pine at different ages and for different localities. It is especially 

 valuable to predict the yield of planted stands, since such stands 

 are most likely to fulfill the conditions of the table. To make 

 such a table it is necessary to select a large number of sample 

 plots, one-quarter or one-eighth acre in size, taking care that the 

 plots represent a great variety of ages, and as broad a range of 

 locality and growing conditions as one can expect to find in a 

 State of the size of Massachusetts. All the trees on the sample 

 plots are measured for diameter and height, and the amount of 

 lumber in each obtained from volume tables. 



This work was in charge of Mr. H. O. Cook of this office, who 

 had the assistance of Messrs. W. G. Howard and R. F. Weston 

 of the Harvard Forest School, and Mr. R. C. Hall of the Yale 

 Forest School. During two months, July and August, they 

 measured one hundred and seventy-eight plots, in fifty-two 

 towns. The accompanying map shows the towns and gives a 

 clue to the number of plots measured in each. Other towns were 

 visited, but as no plots were measured in them, no record of them 

 was kept. 



The travelling was largely done on foot; wood-using factories 

 were visited, fire wards interviewed, and in various ways a great 

 deal of general but valuable information on the forest growth, 

 lumber prices, and on other subjects of interest to foresters was 

 picked up and made note of. 



The accompanying map is not alone useful in connection with 

 the yield table work, but it gives some clue to the pine distribu- 

 tion in the State. The sections visited were naturally the leading 

 pine-growing regions, and within these regions the amounts in 

 the different towns are roughly proportional to the number of 

 sample plots measured in those towns. The region of greatest 

 production is in the northern part of Worcester County, together 



