4 DEPARTMENT OP AGRICULTURE BULS. 301-325. 



Department Bulletin No. 305. — Exercises with Plants and Animals for 

 Southern Rural Schools: Page. 



Introduction . 1 



September 2 



October J 12 



November 21 



December 30 



January 37 



February 43 



March 49 



April and May 55 



Appendix 61 



Some groups of birds 61 



Planting table 62 



References 63 



Department Bulletin No. 306.— Some Effects of Selection on the Pro- 

 duction of Alkaloids in Belladonna: 



Introduction 1 



Selection of typical plants 2 



Method of controlling pollination 2 



First-generation plants from cross-pollinated parents 3 



Comparison of first-generation plants from cross-pollinated and close-pol- 

 linated parents 6 



Second-generation plants from cross-pollination 11 



Reproduction of selected plants from cuttings . . ." 18 



Conclusions 19 



Department Bulletin No. 307. — Tests of Corn Varieties on the Great 

 Plains: 



Introduction 1 



Natural limitations to corn production 1 



Adaptability of varieties 3 



Time required for maturity 7 



Results of tests of varieties 8 



Summary of tests 17 



Publications of United States Department of Agriculture relating to tests 



of corn 20 



Department Bulletin No. 308. — Shortleaf Pine : Its Economic Importance 

 and Forest Management: 



Adaptability for forest management 1 



Name 2 



Present supply 2 



Annual cut of southern yellow pine 5 



The wood 6 



Lumber industry 11 



Stumpage value 21 



Essentials of forest management 24 



Protection 24 



Yield 27 



Rotation 32 



Thinnings 34 



Cutting and reproduction 45 



Cutting on the national forests of Arkansas 48 



Regeneration by sowing and planting 51 



Appendix 56 



Publications of the United States Department of Agriculture relating to 



forest management 67 



Department Bulletin No. 309. — Zacaton as a Paper-making Material: 



Introduction 1 



Botanical history and systematic position of zacaton 3 



Distribution of zacaton 6 



Laboratory tests of pulp production 10 



Micromeasurements of fiber and other cells 14 



Chemical investigation of the grass and pulp 15 



Cellulose from zacaton 18 



Semicommercial tests of the pulp 20 



Physical tests of zacaton papers 25 



