50 



MAPLE-SAP SIRUP. 



DISCUSSION OF MANUFACTURING DATA. 

 CAMP DATA. 



The camps varied in size from only a few trees to those containing 

 about 9,000, the average ranging from 500 to 1,000 trees. The 

 largest camps were found in Lewis County, N. Y., and some of 5,000 

 trees in Vermont. Hard, or "rock," maples were the ones generally 

 tapped, although three samples from Maine (Nos. 6692, 6693, and 



6698), one from Ver- 

 mont (No. 6635), and 

 one from Canada 

 (No. 6915) were from 

 soft maple . The soil 

 varied from gravel to 

 limestone and nor- 

 mal sugar-land soil. 

 The amount of sap 

 obtained varies con- 

 siderably with the 

 season, the tree, and 

 the amount of foliage 

 in the previous sum- 

 mer. The figures 

 given by the makers 

 visited ranged from 

 8 to 50 gallons, the 

 average being about 

 15 gallons. This fig- 

 ure is of ten expressed 

 in pounds of sugar 

 per tree, in Vermont 

 and Canada 2.5 

 pounds being the 

 average figure, al- 

 though some re- 

 ported as high as 7 

 pounds and as low 

 as 0.5 pound. 



The length of the season varied, averaging about three weeks, 

 covering from five to eight runs. The season of 1909 in Indiana and 

 Ohio was unusually long, while in Vermont and Canada there was a 

 short season of only three or four runs. 



The quantity of sap necessary to produce a gallon of sirup depends 

 on the sucrose content, 21 gallons of a sap containing 3 per cent of 

 sugar being necessary to make a gallon of sirup, while more is required 



FIG. 2. Examples of covered buckets. 



