LXXX GUNNAR SCHOTTE. 
year-old and nineteen-year-old stands, the considerable productivity of as much 
as 125 cub. m. of trunk wood. 
In section F. are treated the diseases and iniuries of Japanese larch. 
In Sweden it appears that canker in the Japanese larch was first observed by 
the present writer in 1914 in Omberg Crown Park, where more than half 
the trees were attacked in a young stand that had not yet closed up. In 
1915 the present writer found it also on Visingsö, but only to a slight extent. 
Though it is thus clear that this larch also is attacked by Dasvscypha, yet 
it is not injured to the same extent as the European and Siberian species 
of larch. The reason for this is to be sought in the strong growth of the 
Japanese larch during the 5—20 years of age, which is the most critical 
period for the larch. As has already been mentioned, this larch is also more 
tolerant of shade than the other species of larch; and accordingly, over- 
shadowed trees do not lead the same languishing life as larches of other 
species and therefore are not infectious to the same degree. 
Finally, in section G., there are given some short accounts of the properties 
and use of Japanese larch timber (p. 772), following KUMÉ (553) and JAMES 
MARSHALL (562). 
Chap. VI. The West American Larch (£L. occidentalis). 
After an account (pp. 773—774) of the natural distribution of this larch 
and its introduction into Europe, it is stated that Professor HENRY, who has 
travelled about in Sweden and is keenly interested in Swedish forestry, sent 
some 100 gms of West American larch seed to the present writer, who 
sowed them in his nursery on Lidingön in May 1909. This is the first 
experiment with this larch in Sweden. The seed sown on Lidingön germinated 
excellently, and the plants that came up grew strongly, specially during the 
year 1910 (see Fig. 104). In April 1911 somewhat more than 2000 plants 
could be taken up; and these were sent to be planted out in four places in 
Central Sweden, as is shown by the map in Fig. 103. 
Of these seven-year-old experimental cultures, whose greatest height is 1.8 m 
and whose mean height is 70—80 cm., it is, of course, too early to judge. 
That the plants at Gammelkroppa and Bispgården suffered from frost need 
not be alarming in itself, as they should soon get past the most critical frost 
stage. Attacks by larch-canker have not yet been noticed in more than one 
of the experimental plantations; but they will certainly occur in greater 
numbers, as the hopes of obtaining in the West American larch a species 
immune to canker have been disappointed also in England (according to 
BORTHWICK, 444) 
Chap. VIL. The East American Larch /Larix americana). 
After an account (pp. 779—780) of the natural distribution of this spe- 
cies, there is given an account of its introduction into Europe. 
In Sweden this larch would seem to have been already tried in the seventies, 
according to statements by ROSSANDER (r66). Some of the oldest specimens 
in Sweden are probably to be found in Alnarp in Skåne, where, according 
to” ULRIKSEN (249), they were planted in 1890; and in 1907, according to 
