— 70 — 



ig. Seeds of different species may vary in sprouting in reference 

 to weight. 



20. The color of the seed in some cases is a tolerablj^ accurate 

 measure of rapidit}' and per cent, of sprouting. 



21. When there is any variation in viabiHty in reference to color, 

 it is usually found that the stronger sproutings occur in the darker 

 colored seeds. 



22. The relative values of seeds of different colors vary with 

 each species, or sometimes with each sample. 



23. The latitude in which seeds are grown may determine 

 their behavior in germination. 



24. Northern grown corn appears to germinate quicker than 

 southern grown corn. It is to be expected, from our knowledge 

 of the variation of plants in reference to latitude, that seeds of 

 most species will give similar results. 



25. Variation in results of seed-tests ma}' be due to the appa- 

 ratus in which test is made. 



26. Those apparatuses in which the seeds are exposed to light 

 are to be distrusted. 



27. Those apparatuses which afford no protection to the seeds 

 other than a simple layer of cloth, paper, board, or similar cover, 

 are usuall}' unsafe, from the fact that they allow of too great ex- 

 tremes in amounts of moisture. (Cf. Tables 2, 3, and 41.) 



28. The so-called Geneva tester appears to give better results of 

 sprouting than tests made in soil, probably from the fact that 

 moisture and temperature are less variable than in the soil tests. 



29. In order to study germination to its completion, tests must 

 be made in soil. 



30. Tests made indoors are more reliable than those made in 

 the field. 



II. Results commonly vary between tests made under appar- 

 ently identical conditions, even with selected seeds. Therefore, 



31. One test cannot be accepted as a true measure of any sam- 

 ple of seeds. 



III. The results of actual ordinary planting in the field cannot 

 be considered a true measure of the viability or value of any sam- 

 ple. 



IV. Rapidity of sproutings, unless under identical conditions, is 

 not a true measure of vitality or vigor of seeds. 



