102 



FORESTS, FOREST LANDS AND FOREST PRODUCTS. 



The surface of one narrow face of each pair was continuous with 

 the surface of the face below, which w^as hacked during 1893, and 

 the turpentine which exuded from the freshly chi|)ped surface of 

 this narrow face was allowed to run down the entire surface of the 

 old face into the box cut at the foot of the tree. 



Across the base of the other narrow face, which began at the 

 upper edge of the old face, a metal gutter was driven into the 

 wood. This gutter turned the turpentine into a metal cup which 

 hung on a staple beneath it. Chipping was begun on these 

 faces April 20th. Both of these narrow faces were hacked at the 

 same time and the same number of chips were taken from each 

 face, so that the length of both faces was kept equal. Both the 

 metal receptacles and the boxes were emptied six times during the 

 running season. The turpentine taken from the boxes was such 

 yellow dip as is commonly collected from second-year boxes. The 

 grade of the turpentine collected in the metal cups was virgin 

 dip, exceedingly free from bark, leaves and chips. It will be 

 understood, from the fact that each of the narrow faces had a 

 breadth of only six inches, that from the six faces in either set 

 there should have exuded only about as much turpentine as is 

 usually collected from three of the large-size faces, fourteen inches 

 broad. 



The net weight of the turpentine collected by all of these boxes 

 was 21 pounds; the net weight of that collected by the cups was 

 24 pounds and a few ounces; that is, by the use of the cups 

 there was a gain of one-seventh in the weight of the dip collected; 

 or had the faces been as broad as they are usually made there would 

 have been during the summer a gain of one pound to each face. 

 The yield of 7 pounds to a box from these picked trees is about 

 one-fifth more than the average yield, wliich is only between 5.5 

 and 6 pounds to a second-year box. How^ever, this is immaterial. 

 What w^e are after is the percentage of the increased jneld collected 

 in the metal cups above that of the boxes. This increase was 

 about 15 per cent, in favor of the cups. The application of this 

 to a crop of turpentine would mean considerable aggregate gain 

 and would show more clearly how large the gain really is. 



Working out the increased yield on this basis, i. e., one j)Ound 



