36 MAINE AGRICULTURAL EXPERIMENT STATION. 



UNIVERSITY OF MAINE. 



Maine Agricultural Experiment Station 

 Orono, Maine. 

 Chas. D. Woods, Director 



189.... 



Station No 



Sir: The sample of seed sent to this station in a 



marked , was received 



It contains per cent by weight of seed of , com- 

 mon name , and per cent of impurities. 



The impurities consist of: Inert matter, . . . .per cent; foreign 



seeds, per cent, of which per cent are noxious. 



•Choice merchantable seed of this species should have a purity 



of per cent; and should be free from 



Remarks 



Respectfully, 



Director. 



Accessory Apparatus. — A chemical balance weighing up to 

 100 grams and sensitive to 1 miligram, kept in a case, together 

 with accurate metric weights. A standard simple dissecting 

 microscope and a large reading glass or pocket lens. Botanical 

 forceps and dissecting implements. An authentic collection of 

 the seeds of the principal weeds and economic plants. 



The balance, microscope and forceps are indispensable to a 

 purity test of seeds. The collection of weed seeds is very help- 

 ful. 



STANDARDS OF PURITY. 



In accordance with Section 4 of the pure seed law, the follow- 

 ing "equitable standards of purity" are tentatively suggested. 

 They are the standards adopted by the U. S. Department of 

 Agriculture and are based upon investigations made by the 

 Division of Botany of that Department. They are here printed 

 without change, and include some seeds not likely to be offered 

 in this State. For convenience of reference the percentages of 

 vitality, as well as percentages of purity are given. 



