BUEEAU OF CHEMISTRY. 597 



market. Circular 100 describes the apparatus and the manner in 

 which it is used. 



For a great man}' years tur])ontine has been sold on the great 

 turpontine markets of this country on the basis of its color according 

 to standards prepared by the naval stores committee of the New 

 York Board of Trade and accepted by the largest primary naval 

 stores market of the world, Savannah. Examination of a number of 

 the standard-type samples for turpentine has shown that different 

 sets of these type samples do not agree closely in color. It is highly 

 important that the standard-type samples should always remain the 

 same from year to year, or at least that type samples can be replaced 

 yearly with the full assurance that the color is the same as that 

 previously used ; therefore efforts are being made to get the primary 

 naval stores markets to adopt specified colors Avhich can always be 

 duplicated by this bureau and which can be checked from time to 

 time and certified to by the department, much as the cotton standards 

 are now certified to by the department. 



The work on production of wood turpentine, its refining, its value 

 as a paint and varnish thinner, and its effect upon the workmen 

 using it in paints has been continued in the laboratory, and the 

 information thus obtained will be used in more extended experiments 

 during the coming year. 



MiSCELLANEOtrS WOBK. 



The testing of deliveries of papers, textiles, leather, turpentine, 

 rosin, and other materials for the several Federal departments is 

 being continued as heretofore and requires much of the time of the 

 laboratory force. Miscellaneous samples, including fertilizers, phos- 

 phate, wastes, and other industrial materials have been examined at 

 the request of the departments and of other bureaus of this depart- 

 ment, and the laboratory is cooperating in the study of methods 

 for the examination of leather and tanning materials. The work on 

 the determination of iron and aluminum in phosphate has practically 

 reached a successful conclusion. Various Government departments 

 are adopting the specifications for paper, leather, etc., which are 

 recommended by the laboratory, and other laboratories of the Gov- 

 ernment are following the lead of this department and have prepared 

 to do testing which for many years was conducted only by this 

 bureau. It is hoped that in the future the various Federal depart- 

 ments and other agencies will make even larger use of the experi- 

 ence and facilities of the laboratory. 



The number of samples examined during the past year, including 

 ihose examined in the laboratory at Dayton, Ohio, are as follows: 



Paper and paper-making materials: 



Washington Inboriitory 2.915 



Dayton, Ohio, laboratory 3, 10.T 



Textiles 104 



Tiirpontinos and rosins 200 



Le.ither and tanning materials 14,S 



Miscellaneous 81 



Total G, 712 



