For purity: Allowing "a" to represent the component being considered 

 and "b" the difference between that percentage and 100, according to the 

 following formula: 



( a X b ) 



Pure seed tolerance=0.6+ ( 0.2 X ) 



( 100 ) 



a sample of timothy guaranteed 99.2% could test as knv as 98.25% and 

 be "satisfactory." 



For germination: The following tolerances are applicable: 



Mean: Tolerance 



96 or over 5 



90 or over but less than 96 6 



80 or over but less than 90 7 



70 or over btit less than 80 8 



60 or over but less than 70 9 



Less than 60 10 



Therefore, a sample of seed guaranteed 85% for germination may be 



as low as 77% and be "satisfactory." 



For Aveed seeds: The law requires in the labeling of agricultural seed 



(1) that the percentage of all weed seeds present shall be shown on the tag, 



(2) that no primary noxious ^veed seeds shall be present in the sample, and 



(3) that, if present, the names of the kinds of secondary noxious -^veed seed 

 and the rate of occtnrence of each shall be stated: (A) Per otnice in Agrostis 

 spp., Poa spp., Rhodes grass, Bermuda grass, timothy, orchard grass, fescues, 

 alsike and white clover, reed canary grass, Dallis grass, ryegrass, foxtail 

 millet, crimson clover, Brassica spp., flax, Agropyron spp., and other agri- 

 cultural seeds of similar size and weight, or mixtures within this group, and 



(B) Per pound in proso, Sudan grass, wheat, oats, rye, barley, buck- 

 wheat, sorghums, vetches, and other agricultural seeds of a size and weight 

 similar to or greater than those within this group, or any inixtures ^vithin 

 this group. 



Certain tolerances are allowed, however, to provide for variation and 

 unavoidable errors, but only within very narro^v limits and for ^vhich there 

 is always a standard formula for computation. Examples: (1) Timothy guar- 

 anteed only 2 per cent weed seeds will not be condemned if it has a 2.59 

 per cent. (2) No primary noxious weed seeds are allowed, but the presence 

 of two such seeds in 50 grams of timothy wotdd not be considered a viola- 

 tion. (3) Similarly, some slight variation from the minimimi requirement 

 for labeling secondary noxious weed seeds will be passed as satisfactory. 



Free Testing 



The Seed Testing Laboratory ^vill allow two free tests, in a given year, 

 to any resident company or person of New Hampshire, but such seeds 

 must be received in the laboratory during the months of October, Novem- 

 ber, December and January. This ninnber of samples, not including mix- 

 tmes, may be analyzed either for ptnity or for germination, or one sample 

 for both purity and germination, free of charge. A given seed company \vill 



11 



