32 
and white specks appeared dispersed throughout the jelly. 
Specimen 12. — 5 cc. gelatine + 1 cc. putrid urine -f 24 
cc. distilled water -f 5 mgms. sodium phosphate. 
After 1 day the surface layer was becoming turbid and 
liquid. 
After 2 days the alteration more advanced, surface of 
jelly semi-liquid. 
After 3 days the jelly at the surface was quite liquid, 
turbid, and offensive. 
This subject is being more fully developed under Dr. 
Koch by Dr. Kozahegyi, and chemists must prepare for a 
new condition of things. 
MICROSCOPICAL AND NATURAL HISTORY SECTION. 
Ordinary Meeting, 9th October, 1882. 
James Cosmo Melvill, M.A., F.L.S., President of the 
Section, in the Chair. 
Dr. Hartog called the attention of members to the fauna, 
especially rich in special forms of Cladocera, found at or 
near the surface of deep freshwater lakes. He urged mem- 
bers to use the tow net whenever they had the opportunity 
on calm, fine afternoons, even at this time of year. 
Professor W. C. Williamson, F.RS., made a communica- 
tion respecting and exhibited a series of preparations from 
the coal measures, illustrating the present state of our 
knowledge of the relations between Lepidodendron, Sigilla- 
ria, and Stigmaria. 
