080 JOURXAL OF FORKSTRY 



as no mention is made of the quality of site for the growth of the 

 birch or of the spruce, nor is there any note on the density of the 

 stand or of height of the birch. These factors must surely influence 

 the rate of growth of the spruce. 



Table 10, page 49, giyes the height of old growth birch at 60 years 

 as 38.5 feet; but Table 13, page 42, gives the height of second growth 

 birch at 60 years as 53.6 feet. A difference of height of 15 feet at 

 60 years is considerable of a difference and is explained, apparently 

 only by two facts, namely. Table 13 relates to second growth birch 

 and was made in Franklin County, whereas Table 19 relates to old 

 •growth birch and was made in St. Lawrence County. Such explana- 

 tions cannot be considered as being adequate for good use of the tables. 



Again, second-growth birch of 6.5 inches d.b.h. is from Table 17, 

 about 42 feet tall, but from Table 13 a birch of similar diameter is 

 about 54 feet tall, while finally, from Table 19, a tree G.5 inches 

 diameter is about 47 feet tall. No definite explanation of these 

 differences is found except that Table 13 was m.ade from data gath- 

 ered on the hardwood type, and Table 1 7 from figures obtained on 

 the spruce flat type. But each of these types may contain a number 

 of qualities of site for birch. No statement is given even as to the 

 type where Table 19 was made. 



Obviously such data can have little value to a forester on any piece 

 of land in the Adirondacks. If these tables were referenced to definite 

 factors of site (elevation, aspect, drainage, etc.) or to height of 

 dominant mature trees, then their value could be guaged w^ith ref- 

 erence to application to the area at hand. 



Table 4 was made on the "hardwood'' type, the same as Table 6. 

 These tables indicate the amount of reproduction which comes in after 

 cutting. Table 4. "all merchantable timber logged," shows 83 seed- 

 Hngs of sugar maple, 578 of beech, and 2,530 of yellow birch. Tn 

 Table 6, where the forest w^as cut for "hard and soft wood" we find 

 1,405 sugar maple, 1,184 beech, and 1,842 yellow birch. But where, 

 finally, the area was logged "to a diameter limit" (Table 4) we find 

 3,779 sugar maple, 1,036 beech, and 224 yellow birch seedlings per acre. 

 Just what "all merchantable timber logged" "cut for hard and soft 

 wood" and "logged to a diameter limit" means is not clearly stated. 



This information as it stands unsupplemented by descriptions, is 

 strictly "sub-lot" information. It is valid only for the spot on which 

 it was gathered. The species of hardwood reproduction which comes 

 in after logging unquestionably is dependent to some extent upon the 



