CONTENTS. \ 



PART I. TANBARK OAK AND THE TANNING INDUSTRY. 



Page. 



Development of the tanning industry in California 5 



Silvical characteristics of the tanbark oak 6 



Range and occurrence 7 



Associates 8 



The production of tanbark 8 



Centers of the industry 8 



Stand and yield 9 



Peeling 10 



Transportation 12 



Quality of the bark 14 



Prolonging the supply 15 



Providing for second growth 16 



Sprout reproduction 16 



Reproduction by seed 17 



Second-growth bark 17 



Quality of second-growth bark 18 



Conservative methods in the woods 19 



Guarding against fire 19 



Tannin-extract processes 20 



Supplemental materials 21 



Possibilities of utilizing the wood 22 



Conclusions 23 



PART II. UTILIZATION OF THE WOOD OF TANBARK OAK. 



Tanbark oak lumber 24 



Appearance and characteristics of the wood 24 



Strength '. 25 



Seasoning 28 



Shrinkage 29 



Hardwoods used on the coast 30 



Suggested uses for tanbark oak 31 



APPENDIX. 



Distribution of tannin in tanbark oak 33 



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