of the Galapagos Archipelago. 257 
Leguminose.— Generally firm testa, exalbuminous seeds, and great power of some to retain 
~ . vitality. 
Rubiacee.—The densely corneous albumen of many may afford a sufficient protection to the 
^ seed. 
Umbellifere.—Helosciadium laciniatum is one of the few species enjoying a wide range, for 
^ "which I can offer no explanation. 
Composite.—Exalbuminous seed. Pappus of Baccharis and adhesive pubescence of Sieges- 
—— beckia orientalis. 
Lobeliacee and Scrophularine.—Very minute seeds of Scoparia dulcis and Lobelia Xala- 
E: pensis. 
Rhizophora, Avicennia and Scevola.—' These all have a predilection for salt water, and con- 
P stitutional power in the embryo of resisting its destructive effects. Scevola has a hard 
putamen and scanty carnose albumen ; the other species are exalbuminous. 
Apocynee.—Vallesia I believe to be a salt-marsh or sea-side plant; it has a scanty albumen. 
Convolvulacee.—These have a scanty mucilaginous albumen. Two of them, Jpomea maritima 
^ and Calystegia Soldanella, are sea-side species, with particularly wide ranges. 
Solanee.—Small seeds and adhesive glands of Nicotiana glutinosa; indurated osseous testa 
of Dictyocalyx, Solanum and Lycopersicum. 
Verbenacea.—Exalbuminous embryo and osseous endocarp of Clerodendron and Lantana. 
Labiate, Cordiacee and Boraginee.—Nucumentaceous pericarps and very scanty albumen. 
i Cordia and Boraginee are exalbuminous. 
Acanthacee.--Exalbuminous hooked seeds. 
Plantaginee.—Very dense corneous albumen. 
Plumbaginee and Plantayinee.—Viscid glands on calyx, and hooked prickles of some Pisonie. 
Euphorbiacee and Urticee.—Non-peculiar species of these may have been introduced through 
the agency of man into Charles Island. 
Hypoxidew and Commelinee offer no apparent facilities for the extraordinary range of the 
two species that represent these orders. 
Cyperacee.—These have some facilities for adhesion to foreign substances, and the firm 
` mature of the pericarp, further covered by the coalescing scales of the perianth, are 
protections. 
Graminee.—The ciliated glumes of Poa ciliaris and the awns of Setaria Rottleri are the 
only very evident aids to migration which I can adduce. The resistance of the seed to 
the action of salt water must be very slight indeed. 
Cryptogamia.—The excessive minuteness of the sporules in this great class, together with 
the sporadic appearance of these where they are most minute, and the sudden deve- 
lopment of others in suitable situations, leave little doubt that their diffusion by the 
winds is a never-ceasing though invisible operation, 
