352 JOURNAI. OF FORESTRY . 



overgrew their wounds, and today even the stems that had been most 

 deformed show a normal cyhndrical form, every trace of deformity is 

 gone, and nobody would guess that they had ever been mutilated. 



To be sure, the technical value of the wood has suffered, for the in- 

 terior wounds have left defects. The formation of wound wood over 

 the cankerous places had progressed rapidly in some cases ; in others 

 less so ; from 7 to 27 years were required to outgrow the trouble com- 

 pletely. The infection had taken place at various times, and the prob- 

 ability is that the disease was introduced into the locality with the plant 

 material in 1864. 



The rest of the article by Badoux discusses the proposition that 

 proper silvicultural treatment, proper selection of site, and timely thin- 

 ning are the means of combating the disease. 



Un interessant peuplement de melese a Noville, prcs du lac Lcman. Journal 

 Forestier Suisse, January, 1918, pp. 3-7. 



UTILIZATION, MARKET, AND TECHNOLOGY 



In a study made by Samuel C. Hood in 1907- 

 Variation in 19 12 on the yield of camphor gum from trees 

 the Yield of planted in Florida, an attempt is made to furnish 

 Camphor data that will be of value in determining the com- 



mercial possibilities of such planting. The study 

 included a large number of tests on trees growing under varying con- 

 ditions over a range of latitude of 250 miles, and was made while Mr. 

 Hood was a member of the scientific staff of the U. S. Bureau of Plant 

 Industry. The trees under observation were planted in hedges, in many 

 cases serving as windbreaks for orange plantations. Samples were 

 selected from leaves, twigs, and branches obtained during the dormant 

 period in the winter months. The following conclusions are reached 

 in a summary of the article : 



Factors causing variation in the yield of camphor gum in commercial 

 plantations under Florida conditions are as follows: (i) The maxi- 

 mum yield of camphor is secured from leaves and twigs of the last 

 growth, taken during the dormant season. If allowed to remain on the 

 tree through another growing season, the yield is reduced. The yield 

 from young wood is very small and not to be considered from a com- 

 mercial standpoint. (2) Severe pruning to induce a watersprout 

 growth gives a low yield in the leaves and small twigs, while the yield 

 of the wood so produced is very low. (3) The clipping of leaves and 



