Paul Haas and T. G. Hill 357 



(ii) Extraction with cold water. 



The powder was stirred into cold distilled water and after the addition 

 of a little toluene was allowed to stand for 12 hours, with occasional 

 stirring; the supernatant solution was then syphoned off, filtered and 

 evaporated; more distilled water was then added to the residue and the 

 process repeated. 



Fig. 5. Gigartina mamillosa. (Nat. size 



With a view to comparing successive fractional extracts each portion 

 was evaporated separately. 



Exhaustive extraction by means of cold water as above yielded 

 only 18-85 gms. of water-soluble material from 40 gms. of the ground 

 weed in 36 days. 



Whether extracted by hot or by cold water, the appearance of the 

 scale carrageen is a clear gelatine-like substance of a pale dull yellow 

 colour, brittle when quite dry, which apparently keeps well for an in- 

 definite time. Although of similar appearance, it has been found that 



