3^4 
done very well. Seeds of this variety are the only ones so far 
obtained. But it is doing very well when we remember that not 
even the Kew Gardens nor the Gardens in Ceylon, Singapore, etc., 
have been able to obtain these other two varieties, though they 
have been seeking to do so for two years. The Peradeneya Gar- 
dens of Ceylon have 100 seedlings of Manihot Dichotoma grow- 
ing, also the Singapore and Penang Botanic Gardens. The Pera- 
deneya Gardens are constantly asked for seed, they cannot as yet 
supply for planting in the dry lands in Ceylon where the Hevea 
can not be grown. We must not, however, forget that the rest 
of the tropical world always thinks of these varieties as well as 
the Ceara in connection with a dry region and it was only be- 
cause we found trees of the Ceara variety growing and yielding 
so well in our wetest localities, as in Nahiku and Puna, and so 
much better than in the dryer localities, as in and around Hono- 
lulu, etc., that we decided, what subsequent plantings have all 
tended to confirm, that the weter localities, if not too cold, are 
better for the Ceara than the dryer ones here in the Hawaiian 
Islands. Still it would be a wise thing to plant some of these 
Manihot dichotoma in some dry places for experiment. Dr. Ule 
says : 
"If, as is probable, the cultivation of Hevia braziliensis will 
undoubtedly obtain the greatest importance for the production of 
rubber in luxuriant tropical regions, the future has to look to 
Manihot heptaphylla and Manihot piaunyensis as the rubber 
plants for the dry and less fertile areas." Of course, it is only 
fair to say that other observers speak as highly of Manihot dicho- 
toma, which he has left out in this statement. 
To sum up then there are several reasons why the planters of 
Hawaii should direct their attention to these varieties. 
1. In the first place the industry in these Islands is in its in- 
fancy and we should endeavor to test all the different varieties of 
rubber yielding trees which seem to promise well. For we do not 
yet know which species will prove the best in the long run all 
things considered such as early yield, cheapness of installation, 
length of yield with constant tapping, amount of yield, cheapness 
of collection, quality of the rubber obtained, etc., etc., a balancing 
of all of which will give us finally the best species to cultivate most 
largely. The present plantations must necessarily do a great deal 
of pioneer work in this regard, if we have regard to the industry 
for the Islands as a whole. After the present companies have 
shown what can or can not be done commercially with the dif- 
ferent species no doubt many plantations will follow this lead. 
2. These varieties in their habitat yield considerably larger 
quantities than the Ceara and yet thrive under very much similar 
conditions to those in which the Ceara thrives, the variety which 
so far has proved to grow the best here. 
3. Most important of all, here are varieties which promise the 
lowest cost of collection which, quality being equal, is as I have 
said the pivotal point in regard to the whole industry in Hawaii. 
