MR. G. E. HUNT ON BRITISH MOSSES. 99 



(A.) Determination of Chlorine. 



Weight of tungsten hexachloride taken 1 9* 5700 grms. 



„ silver chloride obtained 42*3775 ,, 



„ silver on platinum 0*0265 ,, 



Total weight of silver chloride 42*4127 „ 



Percentage of chlorine 53'6o5 



(B.) Determination of Metal. 



Weighing-tube and boat 67*6054 grins. 



„ ,, and hexachloride 78*0380 ,, 



,, „ and metal 72*4428 ,, 



Weight of chloride 10*4326 „ 



„ metal 4*8374 „ 



Percentage of metal 46*368 



Hence the atomic weight of the metal is 184*25; or 

 taking the mean of the two methods, we have 184*04 as 

 the atomic weight of tungsten. 



I have, in conclusion, to thank Mr. H. Rocholl for the 

 able assistance which he gave me in carrying out the above 

 experiments. 



XI. Notices of several recently discovered and undescribed 

 British Mosses. By George E. Hunt, Esq. 



Bead before the Microscopical and Natural-History Section, Oct. 9th, 187: 



Gymnostomum calcareum, N. & H., var. brevifolium, B. 

 & S. (Gymnostomum viridulum, Bridel.) 



Perennial?, dioicous; stems csespitose, sparingly branched, 

 very slender, a third of an inch in height, of a reddish- 

 brown colour below, upper part pale green, slightly glau- 

 cous ; leaves ovate or ovate-lanceolate, with erect bases, 

 thence spreading, papillose, margin crenulated in the 



h 2 



