350 



On Carrageen. Ohondrus crispus 



(i) Extraction with hot water. 



The powder was sprinkled on hot distilled water contained in a 

 beaker flask heated on a boiling water bath and thoroughly stirred to 

 prevent the formation of lumps. Sufficient powder was added to make 

 roughly a 1 per cent, solution. After heating for half-an-hour, the 

 contents of the beaker were filtered under pressure first through linen 



Fig. 4. Ghondrus crispus. Broad form grown under quiet conditions on shallow shores, 

 harbours, and muddy bays. (Nat. size.) 



and then through filter paper in a Buchner funnel. The residue was 

 repeatedly extracted in this way and the combined filtrates were then 

 poured on to a shallow tinned copper dish and heated over a boiling 

 water bath. When dry the carrageen extract peeled off. 



By this method 70-75 per cent, of water-soluble extract may be 

 obtained. 



