CHEMICAL COMPOSITION OF ZOOCYTIUM. 
447 
the same reagents ; the substance I examined gave a brown 
tint, so resembling some varieties of vegetable cellulose. 
The proof of the existence of cellulose in the Ophrydium is 
interesting as showing that cellulose is not limited among 
animals to the Ascidian family ; its coexistence with chloro- 
phyll, another vegetable product, in the same animal is also 
noteworthy. 
