Paul Haas and T. Gr. Hill 



355 



manufacture of paper, in the finishing of textiles 1 , for thickening pig- 

 ments and in the making of plaster for walls. 



Method of Extracting the Gelatinising Substance. 



The dried weed as received from the collectors was handpicked, 

 foreign algae and other matter being removed; the material was then 

 rapidly rinsed in two changes of distilled water so as to remove adhering 

 dust and sea water salts. The fronds swell much in fresh water and 



Fig. 3. Chondrus crispus. Medium form from fairly calm water. (Nat. size.) 



solution of the gelatinising substance immediately begins; it is therefore 

 essential, if an undue loss is to be avoided, for this preliminary washing 

 to be carried out as rapidly as possible. After rinsing, the plants were 

 squeezed free from excess of water, spread on clean paper and allowed 

 to dry at room temperature and finally in the steam oven. To prepare 

 the water-soluble gelatinising material two methods of extraction were 

 employed : 



1 See The Textile Recorder, 1919, p. 404. 



