CONVENTION OF GERMAN EXPERIMENT STATIONS. 449 



(3) The results of comparative tests by tlie Ilildeslieim and liriins- 

 wick stations and by Macb and Passon' of the citrate and niolybdate 

 methods of determiuiug phosphoric acid in Thomas slag are tabulated 

 without comment. 



The next business in order was the second reading of certain resolu- 

 tions passed by tlio association at the Kiel meeting. These resolutions 

 were ratified and therefore become a part of the official methods of the 

 association. They are as follows: 



(1) The determination of citrate-soluble phosphoric acid in Thomas 

 slag meal is to be made in exact accordance with the directions for the 

 P. Wagner method, using a rotary apparatus. 



(2) Phosphate slag meal should no longer be sold on the basis of its 

 total phosjdioric acid, but the effort should be in the future to have it 

 sold entirely according to its content of citrate- soluble phosphoric acid, 

 dropping the guaranty for fine meal. 



(3) In determining the soluble potassium oxid 10 gm. of the sub- 

 stance which passes a 1 mm. sieve is heated for a quarter of an hour 

 with 400 cc. of water, made to 500 cc. after cooling, and an aliquot 

 taken for the determination. 



(4) The ammoniacal nitrogen in commercial ammonia salts and in 

 fertilizers containing the same is determined by distillation with mag- 

 nesium oxid. 



(5) Magnesia is to be added to the list of ingredients recognized as 

 determining the value of limestone, and is accordingly to be taken 

 account of in examination of such material. 



(G) Concerning the determination of intrinsic worth of beet seed — 



(a) The distinction between large and small seed bolls is discontinued. 



(b) One gram of bolls must produce at least 50 plantlets. 



(c) Out of every 100 seed bolls at least 75 must germinate in 14 days. 



{(I) The foreign matter shall not exceed 3 per cent or the water con- 

 tent 15 jjer cent; however, beet seed with as high as 17 per cent of 

 water may be furnished subject to a corresponding indemnity. 



(7) In the case of feeding stuffs in which the carbohydrates are taken 

 into account, the money value or the indemnity is determined on the 

 basis of the proportion of 3 : 3 : 1, for 1 kg. of protein : fat : carbo- 

 hydrates. 



It was also voted to exclude from the deliberations of the association 

 the Union of Fertilizer Manufacturers, which was admitted at the 

 meeting at Wiirzburg in 1894. 



Dr. Kellner and Dr. Loges were appointed to carry out the resolu- 

 tions of the Kiel meeting in reference to the furnishing of reliable and 

 pure reagents by the chemical factories. 



Upon motion of Professor Maercker it was voted to amend the sec- 

 tion of the constitution relating to the adoption of analytical methods. 

 There was some difference of opinion among members as to whether 

 methods agreed upon should go into effect after the first reading or not 



' Ztschr. angew. Cliein., 1896, Nos. 5. p. 129 ; 10, p. 286 (E. S. R., 8, p. 23). 



