8 



Number a was situated on the south side of the road nearly 

 opposite number 11. It had a top of medium size and a trunk 

 measuring three feet and ten inches in circumference. 



It was tapped by boring a hole two inches deep with a three- 

 fourths-inch bit aud continuing it two inches farther with a half- 

 inch bit. The smaller part of the hole was fitted by means of 

 a rubber stopper Avith a oue-fourth inch tube and the outer 

 part had a half-inch tube similarly arranged. (See Fig. 1.) 

 The smaller tube thus passed through the larger and extended 

 two inches beyond it. By means of a glass funnel aud rubber 

 tubing the sap from the two sections or layers was conducted to 

 different bottles. 



Fig. 1. Insertion of Tubes. 



Number 12 was situated at a distance from the highway, at 

 the foot of a wooded knoll and in moist soil. Its trunk meas- 

 ured four feet and eight inches in circumference, and its top 

 was sparingly branched owing to its surroundings of other 

 trees. It stood, however, on the edge of the grove exposed to 

 the south, and consequently it bled more freely on cold, windy 

 days, than any of the others. 



It was tapped with a hole three-fourths of an inch in diame- 

 ter and four inches deep. Two tubes, one inside the other, 

 were fitted into the hole by means of rubber stoppers, which 

 divided the hole into two sections, each two inches in length. 

 The inner tube extended to the inner section and was three- 

 eights of an inch iu diameter. The outer tube, which was fitted 



