32 GOODYEAR ON GUM-ELASTIC. 



ment of Prince of Wales Island, Singapore, and Malacca. 

 (Jour. Ind. Archip., Singapore, No. 1, 1847, p. 22.) 



This article gives a minute botanical description of the tree, 

 and of the mode of collecting the gum by the natives. 



It gives a description of the properties of the gum, and con- 

 siders its plasticity, when submitted to the action of boiling 

 water at 150° Fahrenheit, to be its great peculiarity and most 

 useful quality. 



Gives the origin of its use as lohips by the Malays. 



Recommends it for surgical uses. 



The fifth notice of Gutta Percha in Silliman's Journal, is 

 in vol. 6, second series, p. 135, (1848.) 



It says : — " The tree affording the Gutta Percha has been 

 referred to the new gums Isonandra of Wight. Dr. Wight 

 described two species, to which M. A. De Candolle has added 

 two others, referred hitherto to Sideroxylon (iron wood.) W. J. 

 Hooker calls the species affording the Gutta Percha, Isonandra 

 Gutta. 



The sixth notice of Gutta Percha in Silliman's Journal, is in 

 vol. 6, second series, p. 246, (1848,) and is an article on Gutta 

 Percha, particularly its chemical properties, by Edward N. 

 Kent. 



Gutta Percha is stated to be " soluble in pure chloroform, 

 bi-sulphuret of carbon, rectified oils of turpentine, resin, gutta 

 percha and tar, also in terebene, hydro-chlorate of terebene, 

 and slightly in pure ether. Of these solvents the first two are 

 the best." 



The seventh notice of Gutta Percha in Silliman's Journal, is 

 in vol. 7, second series, page 203, (1849.) 



This article gives a very detailed statistical account of the 

 collection of Gutta Percha in India and the islands. 



It states that in some regions the substance is becoming 

 scarce, and that the chief supplies must now come from Suma- 



