182 
development of these hairs suggested a microscopical exa- 
mination of them, and the result had been interesting as 
showing that, whether or not the entire mass of the com- 
pound hairs serve for protection by concealment, the com- 
plex structure of their points, which are capable of protrusion 
and have each a bag or gland at their base contained within 
the tubular branch from which they project, fits them to 
act as most efficient weapons of offence. 
March 25th, 1867. 
J. SlDEBOTHAM, Esq., in the Chair. 
Mr. Hurst said he had received a letter from Mr. R. G. 
Brearey, dated February 16th, Douglas, Isle of Man, refer- 
ring to three living specimens of Echinis sphsera, kindly 
sent by him, and received here, in good condition. The 
attempt had been made to keep them alive in artificial sea 
water, but after several days they appeared to be dying, and 
were put in spirit. They are now at the service of any 
members who wish to have them for microscopic examina- 
tion. 
Mr. Brearey mentions in his letter that he had asked the 
man who procured the specimens for him what he knew of 
the habits of the Echini, and was told that they walk by 
by means of their spines, and feed upon any animal matter 
living or dead ; also that they are sometimes eaten boiled, 
and taste like the roe of the codfish. 
The thanks of the meeting were voted to Mr. Brearey for 
his communication and for the accompanying specimens. 
Mr. Dancer, F.R.A.S., read a paper “ On the Microscopical 
Examination of Coal Ash or Dust from the Flue of a Fur- 
