270 Denmark. 
which the problems of the heath are especially fully and 
authoritatively treated, places Denmark in the foremost 
rank in the forestry world. 
Among the prominent contributors are to be men- 
tioned, besides Reventlow and Dalgas, P. EF. Miiller, 
well known by his discussions of the problems of moor 
soils. From 1876 to 1891 he issued a magazine, in 
which Oppermann contributed a history of Danish for- 
estry. The latter author in co-operation with Hauch 
published in 1900 a Hand-book of Forestry. 
