436 JOURNAL OF FORESTRY 



for the larch species in Sweden (S). Experimental cultures are to be 

 carried out with different races of larch (S). 



(d) The silver fir. Sample plots in existing stands of silver fir 

 shall be laid out, to a limited extent, and thinning experiments shall 

 be made with the object of investigating the growing capacity of those 

 stands in comparison with that of the common spruce. 



V. INVESTIGATIONS CONCERNING FOREST LAND 



(a) Types of soil. A detailed study shall be undertaken into the 

 forms of humus in coniferous forests (N), and the studies of the proc- 

 ess of podsolization shall be worked up for publication (N). After 

 this the mould soils of the forest shall be made the subject of investi- 

 gation ( N ) . 



Ling-heaths. The mapping already accomplished shall be prepared 

 for publication (S) ; likewise also the experiments or valuations in 

 forest culture that have been made on ling-heaths with the object of 

 showing examples of their productivity for purposes of practical for- 

 estry (S). Other studies of ling-heaths shall be continued (N). 



(c) The ivater-logging of the forests. The work begun on this 

 subject shall be prepared for publication (N). 



{d) The freezing of forest grounds. The phenomena of freezing 

 shall be studied, partly in combination with experiments in practical 

 silviculture (N and F). 



(e) The conversion of moss lands into forest land. Experiments 

 in draining that have already been carried out shall be studied with 

 reference to the conversion of nitrogen (N). 



An examination of older ditching that has been effected in Norrland 

 in connection with silvicultural experiments (F). 



See also under I (c). 



(/) Investigations into the influence of the life of lozver animals 

 on the nature of the soil shall be carried out, in addition to other ways, 

 by the survey of clearings and of undisturbed stands (N and E). 



VI. OTHER WORK 



The preparation of reports by Royal Foresters on the setting of 

 seed of forest trees shall be continued (S). Annual reports shall be 

 issued of the injuries done by insects in the forest (E). Minor in- 

 vestigations which affect spheres of work in the different sections shall 

 be carried out when opportunitv offers (S. N, E. and F). 



G. A. P. 



