BUREAU OF CHEMISTKY. 141 



(2) Preparation and analysis of 300 samples of wood and bark 

 taken from sections of Qitercus prinus, Quercus rubra, Quercus alha, 

 Quercus velutina, and Tsuga heteropliylla (hemlock) supplied by the 

 Bureau of Forestry. 



(3) Examination of nine unidentified tree secretions from the Phil- 

 ippine Islands, to determine their possible identity with gutta-percha. 



(4) Partially completed investigations on a series of tree secretions 

 submitted by the Philippine Bureau of Forestry, which were fully 

 identified before shipment. 



(5) A comparative study of the properties of synthetic and native 

 camphor. 



(6) An investigation of methods for the extraction of guaiac resin 

 from lignum-vitse chips and sawdust. 



(7) An extensive study of certain products obtained by a new proc- 

 ess devised for the distillation of waste pine wood. The plant where 

 this system is in operation was visited, and the principle of the proc- 

 ess was made the subject of a special report. 



(8) A partially completed study of the chemical composition and 

 physical properties of American wood pulps and wood-j)ulp papers 

 obtained from the manufacturers. 



(9) A microchemical and histological study of the development of 

 the cellular tissues of certain oaks which has been carried on by Mr. 

 B. J. Howard. This work is almost completed and will be accom- 

 l^anied by a review of the literature on the subject. 



(10) Preliminary work on the availability of certain hitherto unused 

 woods as a source of wood jjulp. 



(11) Preliminary work on chemical methods for killing useless 

 timber. 



(12) Analysis of 22 samples of Indian corn for the Division of 

 Botany. 



(13) Determination of the cellulose and pentosans in 30 samples of 

 fruit for the food laboratory. 



(14) The preparation of a card index covering all chemical litera- 

 ture bearing on dendro-chemistry. 



SUGAR LABORATORY. 



Mr. G. L. Spencer was made chief of this laboratory, and the analyt- 

 ical work for the year ended June 30, 1902, included analyses of sir- 

 ups, sugars, sugar beets, sugar cane, etc. The total number of analyses 

 was 2,439, distributed as follows: 



Miscellaneous samples 33 



Siigars in cooperation with the Treasury Department 775 



Sugars for the War Department 5 



Sugar cane 146 



Sugar beets grown on the Department's farm 80 



Siigar beets from the State experiment stations 45 



Sugar beets, miscellaneous samples 1 , 338 



Sorghum cane . - 7 



Melons - - - 11 



Total number of samples .- 2, 439 



The work of the sugar laboratory included also the preparation of 

 replies to letters concerning the sugar industry in general, the editing 

 of the manuscript for Farmers' Bulletin ISTo. 135, "Sorghum sirup 

 manufacture," and the correction of the proof sheets and the revision 

 of Farmers' Bulletin No. 52, '"The sugar beet." 



