300 Professor Anderson on the 



at my disposal was too small to permit any detailed examina- 

 tion ; for the flocks, notwithstanding their bulk, shrink int 

 nothing when dry. Its analysis gave the following results, — 



J 5- 3 90 grains of the pale substance gave 

 .13-995 ... carbonic acid, and 

 I 5-118 ... water. 



{4-470 grains of the pale substance gave 

 11-595 ... carbonic acid, and 

 4-217 ... water. 



Expei'iment. Calculation. 





i. 



ii. 



"~ 







Carbon, * 



. 70-81 



70-74 



71-00 



C 10 



240 



Hydrogen, 



. 10-50 



10-45 



10-05 



H, 4 



34 



Oxygen, . . 



. 18-69 



1881 



18-95 



o 8 



64 



100-00 10000 100-00 338 



These results correspond very closely with the formula 

 C 40 H 34 8 , but the impossibility of forming compounds pre- 

 vents its confirmation. 



Resinous Colouring Matter. — The red alcoholic solution 

 from which the pale substance has been separated, leaves on 

 evaporation a dark-red amorphous resin, which melts at 212°, 

 and solidifies on cooling. It dissolves in alcohol and ether, in 

 all proportions, but is insoluble in water. It gives with ace- 

 tate of lead a dark orange red precipitate, which could not 

 be obtained of definite composition, compounds being formed 

 in different operations, and with various modifications of the 

 process, containing from under 19 up to 34 per cent, of oxide 

 of lead ; and even when the precipitation was effected in pre- 

 cisely the same manner, the quantity of oxide of lead varied 

 as much as 4 or 5 per cent. ; for this reason I did not pursue 

 the investigation of this substance, which most probably con- 

 tains more than one resinous acid. I give, however, two ana- 

 lyses, which were made at an early period of the investigation, 

 on the resin dissolved in ether, and dried at 212°* 



( 4298 grains of the resin gave 

 I. < 10-930 ... carbonic acid, and 

 I 2 462 ... water. 



( 4 298 grains of the resin gave 

 II. < 10890 .. carbonic acid, and 

 2 415 ... water. 



