ami:ric'an stouax I'kODrcno.v "31 



The clTcct produced by the horizontal tappinj^ was similar to hut 

 more extended than that of the vertical scarifying. The distribution 

 of the ducts near the scars on the horizontally tapped tree was con- 

 siderably different in the wood above the uppermost wound from that 

 near the lower cuts. Ducts were largest and most numerous and the 

 wood formation greatest near the top, where the supply of materials 

 from above was most abundant. The end of a lower scar and some 

 of the bark beyond it was present on the specimen examined. It was 

 noted that under the unscarred bark below and beyond the cut more 

 wood was formed, but not more ducts than at the scar itself. The duct 

 formation ceased in this case about 2 inches beyond the end of the scar. 

 About two rows of ducts were present on the average below a lower 

 scar; three or four often appeared above the upper scar, although they 

 frequently were discontinuous in this region. In general, less ducts 

 and wood were formed below the scar than above it (see figs. 3 and 4). 

 Ducts extended more than 2 inches above an upper horizontal scar. 



From the material available it was impossible to determine the full 

 vertical extent of the ducts above and below the various wounds. 



The highest yield of gum was obtained from the horizontally tapped 

 trees ; that is, under this method of operation there was a direct rela- 

 tion between the development of the greater number of gum ducts 

 and the yield secured. 



A marked browning of the sapwood back of the scars occurred, 

 and sometimes extended vertically for some distance in the wood. 

 Some spores and fungous mycelium were found in the wood. 



It was also noted that bees were attracted by the exuding storax, 

 and that borers infested some of the tapped trees. 



CONCLUSIONS AND SUGGKSTIOXS 



The material studied microscopically was too limited to permit the 

 drawing of positive conclusions, but the microscopic study results 

 agreed with those derived from the field experiments. Further field 

 erperiments and special collection /// the field of suitable material upon 

 which to conduct further investigations are essential to obtain a com- 

 prehensive understanding of the practical possibilities of this industry. 

 It seems probable that encouraging storax gathering on an extended 

 scale would result in materially increasing the value of red gum stump- 

 age, and also in utilizing many of the poorer trees now considered as 

 practically worthless for lumber. Scarifying to induce storax produc- 



