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NATURE STUDY REVIEW [8:1— Jan., 1912 



board and then completed from the other side. This assures a 

 smooth edge. After the holes are punched the white bristol 

 board should be pasted on one side of the card, making the 

 twenty-four pockets for the seeds. The names of the seeds 

 to be put into the case should then be written or printed under 

 each pocket and the seeds placed in them. Then a glass should be 

 placed on each side and passepartouted with a .^-inch cloth tape. 

 If this work is done carefully the result will more than repay 

 the time of the making. This collection of weed seeds is used 

 in making purity tests; other cases with additional kinds of 

 seeds for other purposes can also be made. Flower seeds, 

 vegetable seeds and tree seeds, except very large ones, can be 

 put into cases of this sort. 



It adds greatly to the value of the work if the students col- 

 lect their own seeds, which can then be accurately determined 

 under the direction of the instructor. While collecting the weed 

 seed the student becomes familiar with many weeds and to 

 some extent learns their habits. It is these plants near at 

 hand that are most often neglected, though they furnish the 

 most interesting material for study. In making a purity test 

 it is also necessary to have a lens, preferably a tripod, and a 

 pair of forceps, and where a more thorough test is to be made 

 a fairly accurate pair of weighing scales is necessary. A purity 

 test should disclose the following facts : 



Fig. .j. Si;c().\d Division oi>' Trial Samim k. 



