rj r 



Drift- Weed Kelp from Orkney. 251 



Clay, 2-27 



Silica, 4-33 



Soda pure, 14-63 



Soda impure, . >'£^*> ^ -P* 3 . JWQ&& • 4-34 

 Soda with common saHJ cOF .51 id jd 2UO*n 2-20 

 Sulphate of soda, g^ft > } ^ t 9 k>o£< feoiiIqo£ # 17 

 Chloride of sodium, .... 1*21 



Earthy deposit, . riibi 7H9f aiqJ '34 



Water, 25-23 



In another volume of the Annales de Chimie there is a 

 paper by M. Gay-Lussac, (Annales de Chimie for 1828, torn. 

 39, pp. 159-163), on " The Potashes of Commerce," in 

 which he has an analysis of the salts of Wareck, which is as 



follows: otcj eifft x;& f -hmsoig arfrni gut iqeb 



Sulphate of potash, t&qoi ih\ Jtorpman.ai 22-2 

 Chloride of potassium, . m I )dhoaQh h 24*6 

 Chloride of sodium, .-^ aia& ^ J . 9^o^in 5 Bf^ rrodiB! 

 This appears to be a general statement of the constitution 

 of the soluble salts only. Dr Ure, in his Dictionary of 

 the Arts and Manufactures, published in 1840, gives the 

 extremes of his analyses of kelp as follow : — 



( Sulphate of soda, ... 8-0 19*0 J ,i fciJ 



Soluble J Carbonate of soda and j , ^ ^ in&go tail 



Salts. ] Sulphuret of sodium, J bd[n0f) ~ gWW doidw 



Muriates of potash and soda, . 36.5 375 ., 

 Carbonate of lime? 1 *^ 1 te «™ [ ^mW^bW i0 *W D 

 Silica, . . .'•9ff8jf(fuq^iiri«sOiei3l09tft. ^oBxi9 

 Alumina, with oxide of iron, -^teiooS'ftjfdiJG^OB^oJl edi 

 Sulphate of lime, . . . O0 e (8d£*%*sq M 



Sulphur and loss, . . . JH) JK> ^ 



too doiffv/* ? akq8 mq^ofillhjQQ^ alto 



The peculiarity of those results is in the presence of a 

 large quantity of alumina, and the absence of phosphate of 

 lime and alkaline phosphates, which are at variance with the 

 analyses to be described in this paper.* 



There are analyses of the ashes of some kinds of fuci, viz., 



* The quantity of phosphate of lime analyses corresponds with what Dr Ure 

 terms alumina. It would be difficult to explain the source of such an amount 

 of this earth, as alumina rarely or never enters into the constitution of the 

 vegetable kingdom. 



