REPORT OP THE FORESTER. 9 



pines, knowledge of which will afford a basis for detecting adultera- 

 tion of turpentine spirits, a matter hitherto impossible. The chem- 

 ical studies involved in these investigations' were made in coopera- 

 tion with the University of North Carolina. 



BASKET 'WILLOWS. 



The experimental willow holts yielded 1,432 pounds of high-grade 

 peeled rods and 15,000 choice cuttings for free distribution. The 

 increase of interest in willow growing on the part of farmers and 

 others is very marked. 



SPECIAL DENDEOLOGICAL STUDIES. 



A report on the distribution and commercial importance of mahog- 

 any in Florida and adjacent coast islands was prepared, and the dis- 

 tinguishing characteristics of oak woods were studied. 



Part I of the four tree books planned to cover the forest flora of 

 the United States was brought nearly to completion. It describes 152 

 forest tree species of the Pacific slope, with accurate information as 

 to their range, occurrence, soil and climatic requirements, tolerance, 

 reproduction, and longevity, and is designed to be primarily a manual 

 for National Forest officers. Part II, " Forest Trees of the Rocky 

 Mountains," is in preparation. Progress was made in revising Bul- 

 letin 17, " Check List of Forest Trees of the United States," and in 

 preparing a bulletin on the care of street and park trees. 



FOREST HERBARIUM. 



Approximately 1,500 specimens (foliage, fruits, and wood) were 

 added to the collection, which numbers about 4,500 specimens of 

 native and 1,000 of foreign trees. 



Two new tree species were discovered, a brown-wooded NewMexi- 

 can timber juniper (Juniperus megalocarpa Sudw.) and a California 

 live oak {Que^'ciis pricei Sudw.). Many sets of foliage, fruits, and 

 seeds were presented to public schools. . - 



FOREST DISTRIBUTION RECORDS. 



Systematic compilation of authentic records of the range of trees 

 was pushed, and the Service now has the largest and most complete 

 record of North American tree ranges in existence. Substantial addi- 

 tions to earlier information were secured through field notes of 

 Service officers, and notably by the contribution of distribution notes 

 on California trees made by Dr. C. Hart Merriam, based on twenty 

 years of field observation. The result has been to extend remarkably 

 the known ranges of many forest trees, in some instances by hundreds 

 of miles. These data will help greatly toward the preparation of a 

 general forest map of the United States. 



EXPOSITIONS. 



Two hundred forest transparencies were loaned for use at the Pitts- 

 burg Sportsmen's Exhibit, 20 to the exhibit of the Newark, N. J., Tree 

 Planting Society, and 80 to that of the New England Forest, Fish, 

 and Game Association in Boston. 



24102—08 2 



