ANDERSSON ON GALAPAGOS-O ARNES VEGETATION. 
367 
of compound vessels (ducts). Of nineteen Natural Orders, of which 
he has examined one or more representatives, he finds but five 
(Palmeae, Commelyneae, Junceae, Gramineae, and Cyperaceae) have 
compound vessels in all their organs. Six other Orders are destitute 
of these in all their organs (Aspidistreae, Hydrocharideae, Orchi- 
daceae (partim), Aroideae (partim), Lemnaceae, and Naiadeae). The 
larger proportion have them in their roots. Amongst Dicotyledons 
destitute of vessels, as Caspary understands them, are Aldrovanda , 
Nymphaeaceae, Ceralophyllum, and Monotropa. Houttuynia wants 
them in its leaves. The relations of the different modifications of 
vascular tissue in the several organs are described in a few aquatic 
genera of Dicotyledons and in Viscum. Dr. Caspary classifies the 
tissues thus : Planted vasculares of authors, he styles Plantce fasci¬ 
cular es. These are divided into PI. fascicular es vasculares (with 
compound vessels) and PI. fascic. cellular es (with simple vessels). 
The principal modifications of both are distinguished by their 
secondary deposits, whether annular, spiral, reticulated, scalariform, 
or dotted; these adjectives being respectively prefixed to vessel or 
conducting-cell ( cellula conductrix , leitselle) according as they are 
compound or simple. 
We have referred to the often extreme difficulty of determining 
whether the pores of the cross partition walls of vessels be open or 
closed. It is recommended to examine the cross wall under a thin 
covering-glass after it has dried up, when the presence or absence of 
a membrane over the pores or slits may be ascertained by several 
delicate tests, chiefly optical, and, as we believe, very liable to deceive, 
as the colour of the light passing through the pores, or reflected from 
the membrane, the presence of microscopic particles on their 
surface, &c. 
XXXVII.— Om Galapagos-oarnes Vegetation. 1857.— Entjme- 
ratio Plantartjm in Insitlis Galapagensibijs hucijsque 
Observataritm. 1861.— Ueber die Vegetation der Gala- 
pagosinseln. Linnaea, 1862. By N. J. Andersson. 
Erom the very peculiar interest attaching to the Galapagos Archi¬ 
pelago in a Natural History point of view, it is with pleasure we find 
Dr. Andersson at length giving us an excellent resume , in German, 
of the remarkable botanical features of the group, embodying some 
important results, acquired by himself on the occasion of the visit 
paid to the Islands by the Swedish exploring frigate “ Eugenie,” to 
which he was attached as botanist. It is true some twelve years 
have elapsed since Dr. Andersson’s return, but nothing has been 
done in the meantime to disturb his summary. Surely another 
twelve years cannot pass without some worthy enterprise in this 
quarter ! A great deal remains to be done. Were an opportunity 
to offer of getting across from Guayaquil, and then again from island 
