CONTENTS xi 



10. The Degree of Ripeness and the Age of the Seed in Relation 



to Quality .............................................. 101 



11. The Loss through Storage ........................ . ____ 103 



12. Variation in the Keeping Qualities in Different Species ..... 105 

 13. The Testing of Tree Seed .................................... 106 



14. The Determination of Purity .............................. 106 



15. The Average Percentage of Purity in Tree Seed ........... 107 



16. The Determination of Genuineness ......................... 109 



17. The Determination of Viability ............................ 109 



18. The Determination of Viability by Direct Inspection ....... 110 



19. Evidences of Viability from the External Appearance of 



the Seed ........................................ 110 



20. Evidences of Viability from the Internal Appearance of 



the Seed ..... ................................... 110 



21. The Determination of Viability by Physical Tests ......... Ill 



22. The Determination of Viability by Germination Tests ...... 112 



23. Kinds of Germinating Apparatus .................... 113 



24. Germination Tests in Soil ........................ 114 



25. Germination Tests in Media other than Soil ......... 115 



26. The Blotter Test ............................ 115 



27. Germination Tests on Plates of Porous Clay or 



Plaster of Paris ............................ 116 



28. Germination Tests between Strips of Cotton 



Cloth or Flannel ........................... 117 



29. The Germinating Oven .......... ................ 119 



30. Germination Temperatures ......................... 120 



31. Special Treatment to Hasten Germination ................... 120 



32. The Average Viability of Commercial Seed .................. 122 



33. Germinative Capacity, Germination Number, and Germination 



Per Cent. . . .......................................... 124 



34. Variation in the Germinative Capacity of Fresh Seed ...... 125 



35. Germinative Force, Germinative Energy .................... 127 



36. The Utilization Value of Tree Seed ................ " ........ 130 



37. Germination Values as Compared with Tree Per Cent ........ 132 



CHAPTER VIII 

 FOREST TREE SEED AND SEED COLLECTING (Continued) 



1. Seed Production 134 



2. The Location of Seed Areas 137 



3. Judging the Maturity of Tree Seed 138 



4. Time for Collecting Tree Seed 138 



5. Methods of Collecting Tree Seed 139 



6. Collecting from the Ground or from a Water Surface 140 



7. Collecting Direct from the Tree 140 



8. Collecting from Squirrel Hoards 143 



