776 Forestry Quarterly. 



soting plant at Somerville, Texas, and all had been air seasoned 

 for ten months. Each stick was sawed in half, and half of each 

 creosoted by the full cell process. The average amount of creo- 

 sote injected was 13.7 lbs. per cubic foot, and in the specimens 

 which were tested one year after treatment there had been an 

 average loss of creosote by weathering of 3.7 lbs. per cubic foot. 

 The tests were made in a 200,000 lb. Olsen testing machine. The 

 tests included transverse breaking, compression parallel to grain 

 and compression perpendicular to grain. 



Summarizing the final results of the tests made immediately 

 after the timber was treated it was found that the moduli of 

 rupture in the transverse tests was quite uniform and the average 

 of 4,955 lbs. per square inch was considerably lower than is 

 usually given for long leaf pine. The general results show that 

 there is very little difference in the strength of treated and un- 

 treated timber. In a few cases where the untreated sticks were 

 stronger than the treated, an examination of the data shows that 

 knots or defects existed. As was to be expected it was found 

 that the percentage of moisture had considerable influence on the 

 strength of the timber. One stick which contained 55% of 

 moisture in relation to dry weight showed a modulus of rupture 

 of 4,670 lbs. as against 6,160 lbs. for a stick containing only 

 131% of moisture. Only 15 out of 64 specimens failed in tension, 

 the remainder failing by horizontal shear. Seasoning checks and 

 heart shakes seemed to influence the horizontal shearing failure, 

 while a number of knots near the neutral axis tended to prevent 

 horizontal shearing. 



In the compression parallel to the grain test the strength of 

 the untreated specimens was quite marked. The elastic limit was 

 10% greater, the modulus of elasticity 9% greater and the maxi- 

 mum load 9% greater in the untreated than in the treated speci- 

 mens. 



Special tests showed that stringers from the butt end of the 

 tree were stronger in all respects than those from the top, in one 

 case the difference reaching 30% in the modulus of rupture. 



The detailed results of these tests are given in a bulletin of the 

 American Railway Association, Vol. 14, No. 149, September, 1912. 

 The conclusions stated by Mr. McFarland are that: "The data 

 show conclusively that long-leaf pine timber which has been 



