183 



reprccipitate the dextrins with alcohol. Wash the precipitate with 95 per cent 

 alcohol, finally dissolve in water, and then test with iodin. A blank of pure water 

 should also be treated with the same quantity of iodin solution and run with the test. 

 A positive test of erythro-dextrin or amylo-dextrin is sufficient proof of the presence of 

 commercial glucose. 



Mr. Davidson, as chairman of the committee to present the ques- 

 tion of the unification of terms to the International Congress of 

 Applied Chemistry, stated that the committee would present the 

 question according to their instructions at the meeting to be held 

 Max _".>, 1909, and report the results to the association at its subse- 

 quent annual meeting. 



REPORT OF COMMITTEE A ON RECOMMENDATIONS OF REFEREES. 



By R. J. DAVIDSON, Chairman. 



NITROGEN. 



Two recommendations (Nos. 2 and 4, Circular 38, p. 1) made by the referee in 1907, 

 and referred to the referee for 1908, in regard to the use of copper sulphate in the 

 Kjeldahl and ilunnini: methods, were again recommended for final action and were 

 adopted. These changes in the official methods read as follows: 



(1) Bull. M in i()7, revised, page 6, line 4, under "(3) Determination," after the 

 words "sulphuric arid." insert: "From 0.1 to 0.3 gram of crystallized copper sulphate 

 may also be used in addition to the mercury or in lieu of it." 



(2) Bulletin 107, revised, page 7, line 4, under "(3) Determination," after the 

 words "sulphuric arid." insert: "FromO.l to 0.3 gram of crystallized copper sulphate 

 may also be added." 



Recommendations (3) and (4) offered by the referee for adoption were modified as 

 follows and proposed by the committee for further work, which latter recommendation 

 was adopted: 



Bulletin 107, revised, page 8, fourth line, after the word "time" insert: "Allow 

 i he Hawk to stand without heat for not less than six hours or for a shorter time with 

 shaking at n -iilar interval-." 



(4) Bulletin 107, n-vised, page 8, under "(3) Determination," fifth line, after the 



word "and." insert the same sentence as in recommendation (3). The sentence then 



\.Id ") u'ram- ..i' thiosulphate and allow the flask to stand without heat for not 



less than six hours or for a shorter time with shaking at regular intervals; then heat the 



solution for five minutes." ete. 



POTASH. 



It H recommended 



(1) That the cobalti-nitrite method for potash be tested during the coming year. 

 (See p. li'l 



Adopted. 



(2) That there be a further trial of the method involving the use of ammonium 

 h\ droxid and ammonium oxalate in the preparation of the solution in the determina- 

 tion of the potash in potash salts, as compared with the present method of direct 

 precipitation of the potash without the use of the reagents mentioned. 



Adopted. 



The referee stated that he had not been able to take up the extensive investigations 

 thai would be necessary in attempting to define available potash, and offered the 

 following resolution, which was adopted by the association: 



Resolved, That in view of the fact that practically the entire available time of the 

 referee on potash is needed for the study of analytical methods, the investigation of 



