intervertebral Substance in Fish and Quadrupeds. 187 
properties it resembles mucus, but that under certain circum- 
stances it is capable of being converted into modifications of 
gelatine and albumen. 
The intervertebral fluid of the skate was found to resemble 
mucus ; it did not exhibit any traces of albumen, but the quan- 
tity which I procured for examination being very small, I was 
unable to ascertain its further analogies to the fluid found in 
the intervertebral cavities of the Squalus maximus. 
* 
From the Press of 
W. BULMER & Co. 
Cleveland-Rozv, St. James's , 
London. 
