:7^ 



NEW YORK STATE MUSEUM 



Tree 7 was a red oak with a diameter of i| inches. On May 29th 

 the foliage was rruch retarded in development, the leaves being less 

 than one-fourth the norm.al size and the inner bark showing a variable 

 am.ount of penetration and injury. On June 28th one lim.b was 

 dead and the leaves on the others were only one-half the norm.al size 

 and pale green. The inner bark showed a little discoloration. On 

 November loth this tree was still alive though the oiled portion of 

 the bark was manifestly browner and m.ore discolored than that 

 which was not treated with the insecticide. 



Tree 8 was a red maple with an approxim.ate trunk diameter 

 of i^ inches. On May 2gth the oil had penetrated the bark very 

 little or not at all and the foliage appeared to be norm.al. On 

 June 28th the foliage was yellowish green and possibly som.ewhat 

 abnorm.al. The inner bark was hardly discolored. On November 

 loth this tree was alive though the bark showed a deep and m.arked 

 discoloration in spots, in certain sections this evidently extending 

 to the sapwood and in som.e instances probably into it, in som.ewhat 

 the sam.e manner as recorded above for the cut red maple lim.b. 



Tree 9 was a large hornbeam with a diameter of about 2 inches. 

 On May 29th there was very little evidence of penetration of the bark 

 by the oil and the foliage appeared to be norm.al. On June 28th the 

 inner bark was possibly somewhat discolored though the foliage was 

 norm.al or nearly so. On November loth the tree was alive though 

 apparently with some discoloration of the inner bark. 



Tree 10 was a large hornbeam, with a diameter of 2 inches. On 

 May 29th there was very little penetration of the bark by the oil 

 and the foliage appeared to be norm.al. On June 28th the inner 

 bark was possibly som.ewhat discolored and the foliage norm.al 

 or nearly so. On November loth there was apparently som.e dis- 

 coloration of the inner bark by the oil. 



It will be noted that six out of ten trees died within six months 

 after the treatm.ent and under conditions which hardly justify any 

 other verdict than that of death as a result of oil injury. It is true 

 that ordinarily m.uch larger trees would be treated with this or similar 

 preparations and therefore the probabilities of injury would be less, 

 owing to the thickness of inert outer tissues which m.ust be penetrated 

 before the oil can invade the living and necessary vital cells of the 

 inner bark and outer sapwood. It is well known that a heavy 

 lubricating oil, the gi^een grease of the m.achinist or the anthracene 

 of the chemist is a very dangerous m.aterial to apply to the trunks of 

 trees, and in a preparation containing such a high percentage of this 



