83 
fire is too hot, the result will be somewhat above the true 
yield, owing to combined carbon. 
Besides the percentage of iron, it is readily possible to 
judge of the quality produced and of the nature of the 
impurities present, by the physical characters of the button 
and slag. [Of these, many specimens were shown from iron 
ores of various kinds, and the indications which they give 
pointed out. ] 
As the general result of many experiments, it is found 
practicable to determine by this mode of assay, (1) the quality 
of the ore, by the slag; (2) the yield of the ore; and (8) the 
quality of metal produced. The process recommends itself 
as a quick and easy way for the superintendent of a furnace 
to test his ores. 
Dr. H. C. Boiron exhibited about eighty engraved 
portraits of chemists, many of them of considerable interest 
and rarity, which he had collected in Europe and in this 
country during the two years previous. He also exhibited 
an album containing over 100 carte-de-visite photographs of 
deceased and living chemists of France, Germany, England, 
and America. 
December 15th, 1873. 
President Newberry in the chair. Sixteen persons present. 
Dr. FEUCHTWANGER announced the the death of Prof. 
Louis Agassiz, an Honorary Member of the Lyceum. 
_ On motion, it was resolved that a committee be appointed, 
to consist of the President and two others, to draft resolutions 
expressive of the feelings of the members of the society in 
view of the death of Prof. Agassiz, and of the loss therein 
sustained by science. 
The PRESIDENT appointed Dr. B. N. Martin and Mr. Din- 
widdie as the other members of the committee. 
Mr. WILLIAM Faux exhibited several specimens of fishes 
from a new locality in the Trias of Connecticut. They occur 
