a Veyeto- Calcareous Hydrate. 209 



rated, when evaporated to dryness, left a minute portion of 

 yellowish membranous matter, exactly similar to the residue 

 remaining after the evaporation of the water from the 

 gelatinous mass itself. 



When the mass is digested in alcohol, the water is taken 

 up, and the vegetable matter remains. 



Muriatic acid, with the assistance of heat, produces effer- 

 vescence, and separates the mass into a few flocks, which 

 float in the liquid. 



Caustic Potash dissolved a portion of the mass ; but the 

 greater part remained swimming in the ley in the form of 

 aluminous like flocks, which were phosphate of lime. 



Fifty grains of the mass were carefully evaporated on the 

 sand bath in a platinum crucible, till the whole of the 

 water was expelled, and a yellowish membranous substance 

 lined the internal surface of the crucible. The loss amounted 

 to 48*77 grains, leaving for residue 1*23. The residuum 

 was exposed to a red heat. The white powder which re- 

 mained weighed "125 grain. It dissolved with effervescence 

 in dilute muriatic acid, and was precipitated by caustic am- 

 monia and oxalate of ammonia. The membranous matter, 

 when digested in water, swelled up like gum, and possessed 

 an appearance similar to the original gelatinous mass ; its 

 taste was also the same. 



The composition of the gelatinous hydrate was therefore 



Water, 97-53 



Vegetable matter, 2*21 



Carbonate of lime and Phosphate of lime, *25 



100-00 



Article V. 

 The Art of Dyeing. 



Of the Water. — The water which the dyer employs must 

 be as pure as possible. The purest and clearest colours are 

 obtained in all cases by the employment of distilled water, 



• From the " Farben Chemie. 1 Thiel ; Die Kunst zu farben gegnmdet auf das 

 Chemisette Verhalten der Baumwollenfuser zu der Salzen und Sauren." Von Dr. 

 F. F. Runge.— Berlin, 1834. 



VOL. III. 1 J 



