of the Galapagos Archipelago. 261 
further conclusions, the numbers representing the relationship of the peculiar 
and non-peculiar plants of each islet to one another being small. "There is 
however one point which demands a notice, and that is, the obvious relation 
between the distribution of the peculiar species over the four islets in ques- 
tion and the direction of the easterly current. Chatham Island being situated 
east of the group, it follows that the current can never transport insular spe- 
cies to it: on the other hand, Albemarle, on the west, lies directly in its 
course. Now, excluding the American plants altogether, we have the follow- 
ing evidence of the western islands being peopled by colonists from the east- 
ern; shown by the proportion each islet contains of the Galapageian species 
found on others. ' 
Chatham Island; its Galapageian species found on other islets are to whole florula as 1 : 5:0. 
James Island ; its Galapageian species found on other islets are to whole florula as 1 : 4:8. 
Albemarle Island; its Galapageian species found on other islets are to whole florula as 1 : 3:9. 
Charles Island; its Galapageian species found on other islets are to whole florula as 1 * ks 
The amount of difference between the islets is, as I have stated above, 
mainly specific, and is apparent in no less than fifty-eight of the peculiar spe- 
cies of the archipelago, which thus represent one another, and for whose names 
I would refer to the catalogue of the species already before the Society. 
The above remarks I have confined to the most salient features of the Ga- 
lapageian Flora, and such as I would hope may not be materially affected by 
future investigations in this most interesting archipelago. "There are others 
which appeared prominent, it is true, but which required for their confirma- 
tion more ample collections than have hitherto been formed, and these I have 
suppressed until materials for their establishment shall be forthcoming *. 
Royal Gardens, Kew, November 1846. 
* The following described species, collected by the late T. Edmonstone, Esq. in Charles Island 
together with one undescribed found by Mr. Darwin in Chatham Island, were omitted in my TESS 
tion, but are included in the foregoing remarks. 
; 1. Digitaria serotina, Michx.—2. Alternanthera radicata, n. sp. (See below).—3. Heliotropium In 
dicum, L.—4, 5. Clerodendron, species 2 (exemplaria manca).—6. Hyptis capitata, Jacq.—7. Varron i 
dasycephala, Desv.— 8. Nicotiana, sp.—9. Physalis, sp.—10, ns Solani, species 2.—19. Calyst i 
Soldanella, R. and S.—13. Wedelia frutescens, Jacq.—14. Spilanthes Acmella RAPAS 
—16. Baccharis pilularis, DeC.—17. Composita.—18. Galactia, n. sp. 
2M2 
,L.—15. Eupatorium ? sp. 
—19. Poinciana pulcherrima, L. 
