EXERCISE XXXII. 

 IDENTIFICATION OF GRASS "SEEDS." 



Supplies for a Laboratory Section of Twelve % Twelve small vials of each of the following: orchard grass, 

 brome grass, meadow fescue, red top in chaff, Kentucky blue grass, perennial rye, timothy, cheat or chess. A 

 few mixtures of grass seeds prepared by the instructor. "Prepared Mixtures of Grass Seeds." Twelve tripod 



magnifiers. 



Part A. Detection of Adulterants and Su bstitutes. 



DIRECTIONS. In answering the following questions hit upon one to five (preferably 

 two or three) important and strongly distinguishing points of difference. In recording these 

 points of difference use the accompanying "Comparison Blank." Keep your observations on 

 points in which comparison is made on corresponding lines in the two parallel columns. 

 Note, for example, how comparison is made between the "seeds" of brome grass and perennial 

 rye grass as called for in the first question. 



1. (a) How could you detect the "seed" of perennial rye in that of brome grass? 



(b) How could you detect perennial rye in meadow fescue? 



(c) How could you detect perennial rye in brome? 



(d) How could you detect cheat in brome? 



(e) How could you detect cheat in meadow fescue? 



(f) How could you detect cheat in orchard grass? 



(g) How could you detect meadow fescue in brome? 



(h) How could you detect meadow fescue in orchard grass? 

 (i) How could you detect red top in blue grass? 

 (j) How could you detect timothy in red top? 



COMPARISON BLANK FOR GRASS "SEEDS." 



103 



