4 Nr. 2. C. H. OSTENFELD and C. SYRACH LARSEN: 
has been examined by OSTENFELD on the occasion of his visits 
to those cities; and the collection of the late Professor HENRY 
in Dublin has been studied by SYRACH LARSEN, as well as 
those at Kew and the British Museum. Material has further 
been placed at our disposal by the kindness of Professor 
SZAFER in Krakow, Professor B. FEDTSCHENKO and Pro- 
fessor SUKATSCHEW in Leningrad, and, finally, we have, of 
course, made use of the museum-collection at the Botanical 
Gardens here in Copenhagen. OSTENFELD has personally seen 
L. laricina and L. Lyallii on the spot in Canada, and L. decidua 
in the Alps, while SYRACH LARSEN has studied the various 
forms of larch cultivated in England from early times, as 
well as Mayr’s cultures in Grafrath. We have been fortunate 
in having been able to make use of the original material 
of most of the species or varieties described in recent times, 
namely: L. Mastersiana, L. sinensis (=L. Potanini), L. olgensis 
(= L. Gmelini var. olgensis), L. Griffithiana, L. occidentalis, L. 
Lyallii, L. coreensis (=L. Gmelini var. olgensis), as well as L. 
pendula (=L. decidua X laricina), and specimens from the 
original localities of L. Principis Rupprechtti (=L. Gmelini var. 
Principis Rupprechtii), and L. alaskensis (L. laricina), so that 
we have been enabled to arrive at very fairly definite con- 
clusions with regard to the conception of the species and 
their more important varieties. 
In addition, we have received support from various 
quarters connected with forestry in this country, numerous 
owners of woods, and foresters having sent us material; 
similarly, the director of the Danish Experimental Forestry 
Service, Professor Dr. A. OPPERMANN, has kindly allowed 
us to make use of his valuable collection of larches 
in the Nursery Gardens at Egelund, and has, moreover, 
evinced warm interest in our work. We have also received 
