125 



For comparison, the percentages of gutta. resin and dirt have 

 been calculated tor the dry material as lollo\\> : - 



No. 1. 



(rllttM T ^ 11 



w U I. L a J uUa 11 



Putih. 



No. 2. 

 ( Jrutta 

 Simpor. 



No ? 

 Gutta 

 I aban 

 Chaia. 



No. 4. 



( rl 1 f t A 



V.J Ul Id 



Minjato. 



No. 5. 

 Gutta 



vl LI L Ld 



Susu. 



\o 6 

 Gutta 



I 'j nil 11 



Me rah. 



VJULLd. } O . 







-0 u 



- 4 



/ e u 



Resin 53-5. 



46*0 



440 



720 



867 



i5«u 



Dirt and In- 

 soluble mat- 

 ter 8*0. 



8*5 



34 



5'° 



lO'ij 



y*o 



Ash (included 

 in dirt) 0*77 



2*16 



1-64 



0' 7 



0-9 



1 



These results show that the sample ol" Gutta Taban Merah, 

 No. 6, which represents the highest class of gutta-percha, is of 

 excellent quality, and far superior to any of the other specimens. 

 The Gutta Taban Putih. No I , contains a much higher percentage 

 of resin and is therefore much inferior in quality to the preceding ; 

 the gutta which it contains is strong and of good quality however. 

 Gutta Simpor. No. 2, is also an inferior grade of gutta-percha, 

 owing to the presence of much resin, but here again the actual 

 gutta is of good quality. The Gutta Taban Chaia. No. 3. is very 

 similar material to Nos. 1 and 2, but contains a little less resin and 

 its gutta is of rather better quality. The Gutta Minjato, No. 4, 

 and Gutta Susu. No. 5, are not true gutta-perchas, since they con- 

 tain no proper gutta. The "gutta'' obtained from No. 4 was a 

 friable and somewhat waxy substance, possessing little or no 

 strength whilst No. 5 which resembles Pontianac, contained no 

 gutta, but a quantity of rubber-like material, which was completely 

 dissolved with the resin on treatment with ether. Neither of these 

 samples could be utilised for insulating purposes. 



For comparison with the foregoing results, some analyses bv 

 Dr. OBA( 11 of similar samples ot gutta perchas of known botanical 

 origin may be quoted. 



