204 



(4) Focus NODOSUS, L. 



a. Frond. 



b. Charcoal made from a. 



c. Ditto, lixiviated. 



Note. Laminaria digitata is often designated Oar Weed. It differs from 

 the fuci mentioned above, in having a cylindrical portion or stem divided 

 into numerous ribbon-like pieces, and in its brown colour. Fucus nodosus 

 has black, narrow, compressed fronds with single bladders. F. vesicu- 

 losus has a flattened frond with bladders in pairs, one being on each side 

 of the midrib. F. serratus has flattened fronds serrated at the edge, 

 and without bladders. 



(5) TAR. 



(6) PITCH. 



(7) COKE. 



(8) KELP. 



(9) BROMINE. 



(10) IODINE. 



a. Crude. 



b. Resublimed. 



(11) POTASSIDM ACETATE. 



(12) BROMATE, crystallized. 



(13) BROMIDE, crystallized. 



(14) CARBONATE. 



a. Pure. 



b. Anhydrous. 



(15) BICARBONATE, crystallized. 



(16) ,, CHLORIDE. 



a. Crude, crystallized. 



b. Pure, crystallized. 



(17) ,, CYANIDE, fused. 



(18) . ,, IODATE, crystallized. 



(19) IODIDE, crystallized. 



(20) NITRATE, crystallized. 



(21) ,, SULPHATE. 



a. Crude, crystallized. 



b. Pure. 



(22) BISULPHATE, crystallized. 



(23) SODIUM CHLORIDE. 



Note. For an account of the method by which various products ar 

 manufactured from Kelp, see Pharm. Journ. [2], iii., p. 495. 



The above specimens will be found in Case 4 in the Chemical Museum. 



