SEA KA.MltOO AS A SOURCE OF POTASH. 



109 



Table No. V]. — Combination of Basks and Acuj Radicles. 



Locality 



Calcium carbonate 

 Magnesium carbonate i 

 Potassium sulphate 

 Potassium chloride 

 Sodium chloride. . 

 Sodium carbonate 



Total found 



Total soluble salts 



Locabtv 



The composition of the fresh seaweed has been calculated, 

 and the figures are given in Table No. VII. 



Table No. VIT. — Composition of Fresh Sea weed. 



Sea Point. Clifton-on-Sea. Sea Point. Camps Bay. Average- 

 Stem. Leaves. Stem. Leaves. Stem. Leaves. Stem. Leaves. Stem. Leaves. 



87.20 81.26 86.18 82.67 85 



Moisture 



Ash 5. 31 5.83 5.22 5.23 



Lime 305 .366 .264 .292 



Magnesia .191 .294 .170 .242 



Phosphoric o.xide .055 .088 .064 .119 



Potash I . 989 I . 480 2 . 069 I . 324 



Soda (calculated) .692 1.224 .608 1.078 



39 83-59 86.48 81.38 86.31 82.23 



85 4.26 5.40 5.83 5-20 5-30 



255 -245 -305 .416 .282 .330 



178 .213 .199 .307 .185 .264 



053 .066 .067 .191 .060 .116 



574 I. 091 2.159 1.483 1-948 I-34S 



590 .904 .505 1. 164 .621 i.fX)'.^ 



Calculated on the basis of the air-dry material, the following figures are obtained: — 



Table No. VTIL — Composition of Aik-dry Material. 



Locality Sea Point. Clifton-on-Sea. Sea Point. Camps Bay. Average. 



Stem. Leaves. Stem. Leaves. Stem. Leaves. Stem. Leaves. Stem. Leaves. 



Ash 41.48 31. II ZT.T7 30.18 33.20 25.96 39.94 31.31 38.10 29.64 



Lime 2.38 1.95 1.91 1.68 1.75 1.49 2.26 2.23 2.08 1.84 



Magnesia 1.49 1.57 1.23 1.39 1.22 1.30 1.47 1.65 1.35 T.48 



Piiosphoric oxide.. .43 .47 .46 .69 .36 .40 .50 1.02 .44 .65 



Potash 15. .54 7-90 14-97 764 10.77 6.65 15.97 796 14-3^ 7-54 



Sofia 5.41 6.53 4.40 6.22 4.04 5.51 4.40 6.25 4. .56 6.15 



For the sake of comparison I append (Table No. IX) the 

 composition of kelps from the Pacific littoral of the United 

 States of America. (" Economic Value of Pacific Coast Kelps." 

 Bull. 248. Univ. California, p. 199.) 



