172 PROCEEDINGS OF SOCIETIES. 
A small portion hastily prepared showed several forms, mostly Dia- 
toma and Navicula. 
Four slides, being sections made in different directions of a hard 
deposit showing woody structure, found in the body of the Mount 
Diablo coal vein, and termed “Nigger Head” by the miners, were 
donated by Mr. 8. B. Christy. On examination, the wood fibres were 
clearly shown, and their general appearance was that of the oak. 
Mr. Hanks handed in a report on a sample of (so-called) silver 
mud from Oregon. 
Mr. Kinne exhibited several slides of diatoms mounted by Professor 
H. L. Smith, of Hobart College, Geneva, New York, which had been 
received in the way of exchange, and called the especial attention of 
the members to the preparations of Professor Smith and his authentic 
series of diatoms. - 
Mr. J. P. Moore handed in a new fungus, which he described at 
length, and has named Lentinus aurantius. 
