43-i JOURNAL OF FORESTRY 



Plots designed to compare different methods of planting shall be laid 

 out in eight new series with a total area of about 2.4 hectares (F). 

 Older forest cultures carried out by notch planting shall be investigated, 

 so far as opportunity offers (S and F). Existing forest cultures of 

 pine and spruce, with various distances between the plants, shall be 

 revised if need be (S), and new ones shall be laid out in the south 

 and center of Sweden in the experimental parks contemplated (S). 

 In Norrland five new series of such sample plots shall be laid out with 

 a total area of about 6.6 hectares, both the older plots and these being 

 supplemented with auxiliary planting (F). Plots intended for in- 

 vestigating the prospects of sowing and planting on different types of 

 bog after draining shall be laid out in Norrland in twelve new 

 series with a total area not exceeding 4.8 hectares (F). (See also 5^ 

 below.) 



II. THE DEVELOPMENT OF FOREST STANDS 



(a) Productive yield of the forests and forest stands. The investi- 

 gations instituted in order to study the stem form of forest trees, es- 

 pecially pines, shall be continued (S). Material shall be collected and 

 worked up for obtaining yield tables for pine and birch after a thorough 

 low thinning (S). The oak shall be studied, especially on Visingso, 

 in order to make out a preliminary stand survey of its development 

 (S). Studies shall be made on the length of the growing period in 

 the most common forest trees (N). 



(b) Measures for the care of stands. Existing sample plots shall 

 be re-examined and thinned if necessary (S). New plots shall be 

 instituted in different stands for studying the effect of thinning, es- 

 pecially of pine and birch in Norrland, but so far as time permits 

 also in mixed coniferous forests and spruce stands (S) ; and in these 

 attention should be paid to the possibility of setting apart for purposes 

 of comparison untouched areas. 



III. DISEASES AND INJURIES TO FOREST TREES 



(a) Injuries caused by adverse weather conditions shall be studied 

 when opportunity offers, especially on the sample plots (S). 



(b) Diseases and injuries caused by fungi. Studies of rot fungi 

 may also be eventually made (N). 



(c) Damages caused by insects (E). 



Investigations upon. Continued investigations shall be carried out, 

 on the same methods as before upon the influence of the time of cut- 



