Periodical Literature 45 



ble to landslides. In the first six years nearly 600 acres were 

 planted and 100 repaired for about ^2,500, using 462,000 plants 

 and about 1,000 pounds of seed. In addition $600 were spent in 

 grass cutting and $200 in fighting insects. 



H auptversammlung des Mdhrisch Schlesischen Forstvereins. Central- 

 blatt fiirdas ge?amnite Forstweseu. Dec, 1906, pp. 521-2. 



With the purpose in view of determining 

 Treatment with exactly what success the Scotch Pine 



of may grow on shallow bog soils, covering 



Hard-pan. pronounced hard-pan beds, the results of 



detailed studies of stands, respectivelj^ 109 

 and 82 years old, at Rotenburg in the Liineburger Heide have 

 been published by Tacke and Webber. Great pains is taken 

 throughout the paper to give the reader the facts upon which the 

 authors base their conclusions, just enough of theoretical frame- 

 work being developed to give a sj^stem of arranging the data at 

 hand. 



The body of evidence given points to the existence in the eight- 

 eenth century of a Calhina thicket on soil, wet at seasons but 

 not throughout the year, and underlaid with hard-pan. In 1795 

 the area was burned off and the following year trenches were cut 

 through to the upper surface of the hard-pan at intervals of six 

 feet and the sand taken out was spread over the charred surface. 

 On the seed-bed so prepared pine was sown immediately. The 

 young plants flourished remarkably well, due seemingly to the 

 ash left by the fire. This thrift at an early age is one of the 

 striking features about this old stand, and a great part of the pre- 

 sent vigor is credited to the advantages enjoyed in its youth. 



The root system is most influenced by the hard-pan, and di- 

 verted from normal development. The tap-root is not developed ; 

 heart-roots descend obliquely to the hard-pan, branch profusely 

 and cover the surface of this with a dense mat of fibrous roots. 

 Some of these branches have succeeded in penetrating the stratum. 

 Neither in root system, nor in the crown were any pathologic 

 conditions met with, though careful search was made, for it was 

 suspected that under conditions so different from those in which 

 pine grows best such would obtain. 



Chemical analysis of the soil showed there was not the amount 

 of plant food present that the growth of the stands indicate, for 



