28 Director's Annual Report. 
man, and point out briefly some of the interesting points connected 
with the particular plant and its related species; and in some 
cases this is supplemented with drawings illustrating the flowers 
when inconspicuous. ‘To other specimens have been added casts 
of fruit made by Mr. J. W. Thompson. All of the botanical 
exhibits have been moved from the first to the second gallery in 
Hawaiian Hall. 
‘‘In addition to the short trips on this island, two longer trips 
were made to other islands of this group. The first was a trip to 
the island of Molokai as the guest of Mr. G. P. Cooke, the journey 
being made both ways in this gentleman’s private launch. About 
two weeks were spent on the island, and plants collected from 
Keomumu to the western end. It was interesting to note the 
various changes which have taken place in the flora, since the 
previous visit in 1912. Perhaps one of the most interesting was 
the spread of two species of introduced A/77plex, one on the west- 
ern end, the other in the kiawe belt near Kaunakakai. Especial 
thanks are due Mr. Cooke for his many kindnesses and aid to my 
department. 
‘The second long trip was to the island of Hawaii, primarily 
to continue investigations of the plant invasion on lava flows 
begun several years ago. For economical and other reasons these 
trips into regions new to me must cover all lines as much as 
possible; so a large number of plants were collected, and notes 
taken on the flora as a whole. While outfitting in Hilo, which 
was my base, several visits were made to surrounding regions, one 
especially pleasurable one being made with Mr. D. Thaanum, 
who very kindly explained how to collect land shells in the parti- 
cular region. 
‘“The terminal portion of the 1880-1881 iava flow is in Hilo, 
and on account of the much greater rainfall the vegetation on it 
is much more luxuriant than on the flows of known date on the 
dry or Kona side of this island. However, I find that the conclu- 
sions arrived at after a field study of the Kona flows, hold true in 
all important essentials for the flows on this side of the island. 
At the lower elevations on the Hilo side the place of Polypodium 
pellucidum is taken by Nephrolepis exaltata. The amount and 
luxuriance of vegetation is much greater, as was to be expected, 
plant societies already being established on the flow of 1880-1881. 
[144] 
