1863.] REVIEWS. 505 



specimens may be rewarded by the discovery of V. Apaca in 

 England. 



Scirpus carinatus, Sra., is another recent discovery made by 

 onr author. From his remarks on this species, compared with 

 the kindred forms of S. lacustr'is, and S. glaucus, or S. Roihii, 

 he does not appear to be very sanguine about the distinctness of 

 these species. 



Spartina stricta is another new discovery in Belgium ; also 

 Polystichum crislatum, Roth, and Lycopodium Chamcecyparis- 

 sias. Botanists are requested to overhaul their stores of L. com- 

 planatum. It is worth while to look at our hoards of L. alpinum, 

 and try to discover among them L. ChamcBcyparissias , and L. com- 

 planatum, and L. alpinum, — or more than two single gentle- 

 men rolled into one, as the comedian told us in our juvenile 

 days. 



Elodea canadensis [Anacharis, Bab.). M. Crepin has very 

 obligingly sent us the result of a careful study of the above re- 

 cent introduction into (we should not write British, but) Euro- 

 pean waters. From this succinct memoir, our author tells us 

 that it was seen for the first time in Europe by John New, (any 

 relation of our excellent correspondent, Wm. New, curator of 

 the botanical establishment of Bangalore ?) in a piece of water 

 at Warringtown, Ireland. Possibly some of our readers, whose 

 geography is more extensive and of a more recent date than 

 than ours, will tell us where this place is. 



British botanists know that it was discovered in the Grand 

 Junction Canal by a fair botanist, and subsequently, by the late 

 Dr. Johnston, in a pond at Dunse Castle, Berwickshire, at a con- 

 siderable elevation, whence it descended the White Adder, which 

 it filled ; and it now threatens to fill the Tweed. 



M. Crepin does not state when he first observed this pest in 

 Belgium, but merely informs us that it was detected by one of 

 the gardeners in the Botanic Gardens of Brussels, in 1860. In 

 Utrecht, Holland, it was seen in 1861. 



The means of its introduction into Belgium are as mysterious 

 as those whereby it was conveyed to Scotland, and established 

 in the lakes on the spurs of the Cheviots, near Dunse. 



Our author intimates that its dispersion has been promoted 

 {facilitee) by the floating wood. It might have reached the 

 Tweed from the Cheviots on chips or bits of trees, but it could 



N. S, VOL. VI. 3 T 



