374 EXTRACTS AND ABSTUACTS. 



EpigeioH, Elatine hexandra, Eriocaulon septangnlarn, Sparganlumaffine, 

 and I.wetcs echnwspora; and sixteen additions to Di:?tnct Vlll. of the 

 " Cybele Hibernica " were made. Mr. More's principal object was 

 to compare the vegetation of this island with that of Aran, of which 

 Mr. H. C. Hart recently published a tolerably complete catalogue.* 

 The Aran group are Limestone, and the flora typically a Limestone one. 

 In the present paper the plants found in one only of the two islands 

 are shown in parallel columns, with the result of giving 161 species 

 peculiar to Aran, and 92 to liofin, or, deducting naturalised plants, 

 about 120 for Aran and 80 for Bofin. Aran shows in a remarkable 

 degree both the predominance of lime-loving plants and also the greater 

 variety of species "which is usually observed on calcareous soils ; Bofiii 

 exhibits as clearly a series of plants prefering schistose, granitic, or 

 siliceous soils, the only two lime-loving species observed there being 

 Sinapis alba (an introduced weed) and Asplenium Ruta-miiraria 

 (on a ruined wall). No doubt the plants now apparently peculiar 

 will be on further exploration considerably reduced, and the 221 

 species common to both groups will be probably raised to nearly 300, 

 leaving about fifty plants peculiar to the Eofin group and about 100 to 

 the Aran Isles. As the author remarks, *' This is indeed a very striking 

 difference between the flora of two groups of islands situated under the 

 same conditions of climate, and separated by a distance of only thirty- 

 five miles, and shows very plainly how much vegetation is influenced 

 by the nature of the subsoil." 



Bacteria of the Danish Coasts. 



Om nogle ved Banmarhs Xyster levende Bakterier. By Dr. Eco, 

 Warming. (" Vidensk. Med. Nat. Porening Kjoben.," 1875; with a 

 French summary). — All along the Danish, coast there is found, during 

 calm weather in the summer months, a red colouration of the waterclose 

 to the shore. The cause of this singular phenomenon is referred to Bac- 

 terioid masses which cling to Zostera and sea-weeds, and, as might be 

 expected, lose their hold when a storm or a high tide supervenes, and do 

 not regain their position and appear in sufiicient quantity to colour the 

 water until calm has been restored. The wet weather of autumn also 

 breaks up the masses, but during the whole winter it is possible to find 

 plants covered with Bacteria capable of ready revival, even if their 

 habitat be frozen over. Professor Warming has made a study of this 

 subject with his usual care and success, the results of which — the dis- 

 covery of several new specific and varietal forms, and the broaching of 

 theories as to structure, reproduction, and classification —we shall 

 notice in a brief manner. 



Sometimes floating nias-ses composed of Clathrocijstis roseo-persicina 

 occur, but most Bacterioul life is found below the surface ; here, when 

 decomposition has only slightly advanced, one sees principally small 

 individuals of Monas vinosa, but at further stages many other red- 



* Noticed in Journ. Bot, 1876, p. 111. 



