Tapping experlmento on this species were carried 

 out on tho Lasson leot summer end this fall, but vrere not 

 successful. 



noodles, tin.;s and conos of the conifer will 

 also be the subject of steam distillation tests* 



Digger Pine : 



The di^or pino hao boon tapped on the Sierra dur- 

 tho past two seasons. The oleo-rooin of this pine does 

 not yield turoentino, but a product celled heptane, nhioh is 

 invaluable on certoin chemicc.1 tests. If enough of this 

 nroruct wore made available, a steady r.oraand vould be mede 

 for it by chemical laboratories all over tho r.-orld. Tho 

 co^rnd, at 'n-esont, is r.l:noot nothin-, but this is "Mm to 

 a belief that it cannot be su.vpllefi. 



Steam distillation tests vrill also be performed 

 on nocdlos, tin-s, nnc 1 . cones of iho di^or pine. 



Wo fl tern Henloc':: 



Owin<; to cltiros thr.t have boon node concerning 

 this spccioo as boin* superior to Douglas fir for sea- 

 piling, we have Included it in our piling orperlnonts nt San 

 Frar.cisco ancl Srn Die^o. After sevon -oon-ths it hao ahorm & 

 sli ht ettrolc jy the mrrino vrood-borers. On some piles, 



s of tho bar": still adhere, and r.t cuch pieces the oilos 

 have net beon attac.'cod. 



Doubles Fir: 



Poles of this epoclos rere treated for perinanont 

 imir over. out rorl. on the California. Creosote drums v?ere 

 uoori for twiXs . The poloe thct v?oro cut and pooler- in the 

 oumor, caue-hfrc^oncd, and coulc' not bo euccoesfully 

 croosotod, oven at a cost of 50 oonts per pole for 22 ft. 

 polos. 



The sarao difficulty was experienced in our ex- 

 perimental treatments upon Douglas fir cross-ties, In 

 cooperation with the Southern Pccific ?.,-ilroad, v.here with 

 lon boiling in oil, eni : )reac-.iros up to 150 Count's per 

 sruaro inch, f vory oli-rht penetration of oil too': plr.co. 

 The Southern Pacific Co. uses zinc choloride exclusively 

 on their croaBties, although it is but r cli;;ht protection 

 in no 4 3t soil. 



Wo have also plf.coc 1 Lou->lf s fir in our pile 

 oxporir.entc, both croocotod t.nd untrorted. Untrerted ^-ilos 

 fcro r.ttftclioc co a tili-ht ^o^ree by tho marine woodborors 

 in seven months. The creosoted nilos treated with 10 pounds 

 of oil to che cuoic foot, vere not attacked at the end of th 

 a yeer. 



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