26 
Journal of Agricultural Research 
Vol. XI, No. t 
Areas with about two seed trees left for every 3 acres have been 
studied, but the results are questionable because the age classes and 
distribution of seedlings which came in after the slash fire indicated that 
the seedling originated from stored seed. In order to determine the 
effect of seed trees, the complete history of the area will have to be 
obtained by the permanent-plot method. 
LITERATURE cited 
(1) Beal, W. J. 
1884. THE VITALITY OF SEEDS BURIED IN THE SOIL. In 23d Ann Rpt. State 
Bd. Agr. Mich., 1883/84, p. 332-334. (Mich. Agr. Exp. Sta. Bui. 5.) 
(2) - 
1889. VITALITY AND GROWTH OR SEEDS BURIED IN SOIL. In Proc. loth Ann , 
Meeting Soc. Prom, Agr. Sci. 1889, p. 15-16, illus. 
( 3 ) ~- 
1894. the vitality or SEEDS buried IN THE soil. In Agr. Sci., V. 8, no. 6/9, 
p. 283-284. 
( 4 ) - 
1899. The VITALITY OR SEEDS TWENTY YEARS IN THE SOIL. In Columbus Hort. 
Soc. Quart. Jour. Proc., v. 14 (Ann. Rpt. 1899), no. 3, p. 143-144. 
( 5 ) - 
1911. the vitality OP SEEDS BURIED in THE SOIL. In Proc. 31st Ann Meeting 
Soc. Prom, Agr. Soc. 1910, p. 21-23. 
(6) Ewart, E. J. 
1908. ON THE longevity or seeds. In Proc. Roy. Soc. Victoria n. s. v. 21, 
pt. 1, p. 2-210, pi. 1. 
(7) Harrington, G. T. 
1916. agricultural value or IMPERMEABLE SEEDS. In Jour. Agr. Research, 
* v. 6, no. 20, p. 761-796, 6 fig., pi. 106. 
(8) Nobbe, Friedrich, and HaenlEin, Hermann. 
1877. UEBER DIE RESISTENZ VON SAMEN GEGEN DIE AUSSEREN FACTOREN DER 
keimung. In Landw. Vers. Stat., Bd. 20, p. 71-96, 13 fig. 
(9) Rees, Bertha. 
1911. LONGEVITY OR SEEDS AND STRUCTURE AND NATURE OR SEED COAT. In 
Proc. Roy. Soc. Victoria, n. s. v. 23, pt. 2, p. 393-414, pi. 79-81. 
