New Zealand and their Distribution . 
291 
6. The Chathams contain many families of the northern invasion. 
7. The outlying islands have proportionately more families in common 
with one another than they have with New Zealand (Table VI). 
8. The genera of the floras of the outlying islands are chiefly selected 
from the Stewart list (Table VII) ; only 26 out of 140 do not occur there, 
and are mostly northern genera. 
9. The genera that occur in the islands are on the whole the largest in 
number of species, both in Stewart and New Zealand (Table VIII). 
10. The islands have proportionately more genera in common with one 
another than they have with New Zealand (Table IX). 
1 1 . The Stewart genera which are missing are on the whole the smallest. 
12. The species in the islands are also to a very large extent indeed 
selected from the Stewart list. 
13. The Stewart families that have no species in the islands are on the 
whole very small in Stewart. 
14. The islands have very many species in common among themselves. 
1 5. The species in common between three islands (the oldest) show the 
largest proportion of wides (the oldest forms), then those of two islands, one 
island, and those reaching none (Table X). 
16. The plants of the islands show a greater proportion of families to 
genera and genera to species than those of Stewart and New Zealand 
(Table XI). 
17. The. more genera in a family in New Zealand, the older on the 
whole is the family in New Zealand, and the better represented in the 
islands (Table XII). 
18. The same thing shows in regard to the genera. 
19. The plants reaching 3 groups of islands, New Zealand and Stewart, 
2, 1, Stewart and New Zealand only, and New Zealand only, show a progres- 
sive decrease in the average size of families and genera (Table XIII). 
20. All these predictions are also true of the ferns, and the fern flora 
of Stewart, as on the whole older, is better represented in the islands than 
the flowering plants. 
21. The species endemic to the islands only do not occur on two of the 
chief groups without occurring in New Zealand, as one might expect were 
they relicts. 
22. The endemics of the islands belong on the whole to the largest 
(i.e. on the whole the oldest) families of New Zealand. 
23. Practically all the genera of the island endemics, being old, occur 
in Stewart. 
Just as in Stewart, the island endemics belong mainly to the { success- 
ful ’ families and genera of New Zealand. 
24. The proportion of trees is greatest in the northern islands, least in 
the southern, intermediate in the Chathams. 
