ON EUCALYPTUS KINOS. 101 



medicinal and official purposes, all other kinos from what- 

 ever source obtainable. 



Table I. 

 This table shows the comparative rates of gelatinization 

 of tinctures (1 in 10) of the following Eucalyptus kinos with 



(a) Formaldehyde — commercial formalin of which 20 



drops from the same pipette contained *191 gram 

 HOHO. 



(b) Acetaldehyde, of which 20 drops contained "091 gram 



OH 3 OHO. 



Experiments were commenced 14th January 1904, when 

 5 drops of each aldehyde were added to 5 cc. of separate 

 tinctures of each kino, agitated, and stood on one side for 

 20 hours. 



After that time, to those tinctures which had not solidi- 

 fied, 5 drops more of each aldehyde were added to the 

 respective tinctures, and these again stood for 20 hours. 



To those tinctures which had not solidified, 5 drops more 

 of aldehyde were again added to the respective tinctures, 

 and observation repeatedly made until 1st July, 1904. 5 cc. 

 of tincture were taken in all cases. Those tinctures which 

 slowly solidified became much thicker previous to forming 

 a jelly. In the table the following may also be noted : — 



(a) E. pilularis being a quite fresh kino did not so readily 

 gelatinize with acetaldehyde as did the kino of E. dives. 



(b) E. pilularis after boiling acted similarly to the un- 



boiled kino. 



(c) E. Woollsiana, E. hemiphloia, E. pendula, and E. inter- 



texta did not form homogenous jellies with formalde- 

 hyde, but a precipitate separated. 



(d) E. rostrata and E. calophylla (2 samples of each) show 



that the kinos from identical species of Eucalyptus act 

 similarly irrespective of location or date, again illus- 

 trating the chemical constancy of Eucalyptus species. 



