in the Oviducts of the Frog , &c. si g 
No coagulation is produced in this substance, by Voltaic 
electricity, from 30 double plates of four inches. 
These experiments shew, that the substance from the ovi- 
duct of the frog, is of a peculiar nature : its characteristic 
property being the remarkable power of expansion, by the 
absorption of water. 
It is distinguished from gelatine by its insolubility in water, 
and by affording no precipitate with solutions containing tan- 
nin : from albumen, by not coagulating on the application of 
acid, or electricity, and by forming compounds with the alka- 
lies, which are not saponaceous. In some of its other proper- 
ties, it would appear, as far as regards its chemical habitudes, 
to be a substance, intermediate between albumen and 
gelatine. 
The gelatinous substance from the egg of the dog-fish, has 
the properties of that from the oviduct of the frog in its ex- 
panded state, and is consequently analogous to what has been 
termed star-shot jelly. 
