of Barbadoes Aloes. 483 



I. 0*2615 grm. aloine gave 0*5695 carbonic acid and 0*14 

 water. 



II. 0*2415 grm. aloine gave 0*5250 carbonic acid and 0*126 

 water. 



Hydrated aloine. Found numbers. 



Calculated numbers. I. II. 



34 C . . 2550*0 59*47 59*39 59*24 



19 H . 237*5 5*54 5*97 5*79 



15 O . 1500*0 35*09 34*64 34*97 



4287*5 100*00 100*00 100*00 



The formula derivable from these analyses is C 34 H 19 O 15 , 

 which, as we shall presently see, is = C 34 H 18 14 + HO, or 

 aloine with one equivalent of water. 



The aloine which had been dried in vacuo was next heated 

 in the water-bath for five or six hours, and was also subjected 

 to analysis. 



I. 0*251 grm. aloine dried at 212° F. gave 0*550 carbonic 

 acid and 0*128 water. 



II. 0*2535 grm. aloine dried at 212° F. gave 0*564 carbonic 

 acid and 0*129 water. 



III. 0*234 grm. aloine dried at 212° F. gave 0*521 carbonic 

 acid and 0*114 water. 





Calculated numbers. 



I. 



II. 



III. 



34 C 



. 2550 61*07 



60*51 



60*67 



60*72 



18 H 



225 5*39 



5-66 



5'65 



5*42 



14 O 



. 1400 33*54 



33*83 



33*68 



33*86 



4175 100*00 100*00 100*00 100*00 



The aloine employed in these analyses was prepared at 

 three different times. These results give C 34 H 18 O 14 as the 

 formula of anhydrous aloine, that dried in vacuo being a hy- 

 drate with one equivalent of water. 



When the aloine was allowed to remain in the water-bath 

 for more than six hours, it continued slowly to lose weight, 

 apparently owing to its undergoing partial decomposition by 

 the formation of a brownish resin. The loss of weight gra- 

 dually continued for a week or more, but became very rapid 

 when the aloine was heated to 302° F., when it melted, form- 

 ing a dark brownish mass, which when cooled became as hard 

 and brittle as colophonium. It still, however, contained a 

 good deal of unaltered aloine, as I ascertained by crystallizing 

 it out with hot spirits and analysing it. Much of the aloine, 

 however, had been changed, most probably by oxidation, into 

 a dark brown uncrystallizable resin. 



Br om-aloine. — ^W hen an excess of bromine is poured into a 



2 I 2 



