150 Kbport of the Acting Director and Chemist op the 



First. Form of Statement of Guarantee- Analysis. 



1. Nitrogen. — lu a guarantee-analysis, the law permits statement 

 in the form of either nitrogen or ammonia^ or in both forms at 

 once. 



2. Phosphoric Acid. — In order to comply with section 1 of the 

 law, two forms of phosphoric acid must he stated in a guarantee- 

 analysis, both soluhle phosphoric acid and available phosphoric acid. 



To give only available phosplioric acid, or to give only total phos- 

 phoric acid is a clear violation of the provisions of the law, provided 

 other forms are present. There is nothing in the law to prevent 

 the statement of reverted phosphoric acid, or insol uble phosphoric 

 acid, or total phosphoric acid in addition to the soluble and avail- 

 able forms ; but these two latter forms, soluble and available phos- 

 phoric acid, must both be stated when present. 



3. Potash. — In a guarantee-analysis, potash (KgO) soluble in dis- 

 tilled water Tnust be given. 



There is no provision which would prevent one expressing the 

 equivalent of potash (KgO) in the form of sulphate or muriate of 

 potash in addition to potash (KgO) ; but, if only one form is given, 

 it must always be that of potash (KgO) soluble in distilled water. 

 To state only the amount of sulphate of potash or muriate of potash, 

 or to use alone such expressions as " potash s." or " potash sul." is a 

 clear violation of the provisions of the law. 



4. Suggested Form of Statement of Guarantee-Analysis. — For 

 the sake of uniformity and simplicity, we suggest to manufacturers 

 of fertilizers the following form of statement of guarantee-analysis 

 as one which loill be accepted by this Station as conforming with 

 the provisions of the laio : 



Nitrogen percent. 



Soluble phosphoric acid " 



Available phosphoric acid " 



Potash (K2O) 



In place of nitrogen or in addition to it, may be given the 

 amount of ammonia equivalent to nitrogen in a fertilizer. 



The other forms of phosphoric acid (reverted, insoluble and 

 total) may be added. In case no available phosphoric acid is pres- 

 ent, then total alone may be stated. 



The equivalent of potash (KjO) in the form of sulphate or muri- 

 ate of potash may be stated in addition. 



