152 



Henderson he was incredulous, for the very spot was' one he knew as 

 the locaHty of other plants. He not only got the Anacharis there the 

 following summer, but he found it in several places adjacent. Now 

 from Whitehall to Gainslaw Bridge the Anacharis is by far the com- 

 monest plant in the Whiteadder ; and its minute flowers whiten the 

 surface of the water. It is to me quite plain that it is of recent intro- 

 duction. My explanation is this : — The plant has been introduced 

 into the lake at Dunse Castle with alien aquatics, for in the lake there 

 are several foreigners. Then it had multiplied itself there until it took 

 thick possession of some parts of the lake. Now, while they were 

 paddling amongst this herbage, some small bits may have adhered to 

 the plumage of the wild ducks and other aquatic birds, and by their 

 means they have been carried to the Whiteadder. This, as the crow- 

 flies, is about two miles from Dunse Castle, but Whitehall is six miles 

 distant." 



Alluding to the facts mentioned by Dr. Johnston, Mr. G. Lawson 

 stated that the Anacharis had appeared in a somewhat similar man- 

 ner in the neighbourhood of Derby. Mr. Joseph Whittaker, of 

 Breadsall, from whom Mr. Lawson had received a communication on 

 the subject, had been for some years engaged in the examination of 

 the Potamogetons of the neighbourhood, but had never met with the 

 Anacharis until recently, although it is now in great abundance, 



4. ' Report on the state of Vegetation in the Edinburgh Botanic 

 Garden from February 14, to March 13, 1851. By Mr. M'Nab.' 



Cornus mascula 

 Anchusa sempervirens - 

 Primula denticulata 

 Holosteum umbellatum - 

 Orobus veinus 

 Adonis vernalis - 

 Tussilago Farfara - 

 Nordmannia cordifolia - 

 Hyoscyamus Scopolia 

 Arabis prsamorsa 

 ErylLroniura Dens-canis 

 Aubretia gvandiflora 

 Gagea lutea- 

 Aubretia deltoidea 

 Kevria japonica 

 Saxifraga crassifolia 

 Mercurialis perennis 



