712 
Trans., R. S., London, 164 Vols. in calf, for $1500,* was 
made by Mr. P. Munzinger, 1908 Rittenhouse Square. 
Mr. Cope made some remarks upon North American 
species of extinct Rhinoceroid mammals, and exhibited 
specimens to illustrate their different characters. 
Mr. Cope then spoke of the extinct vertebrata of the Per- 
mian System of the United States. 
A second communication was received from Dr. Gatschet 
of Geneva, “ On the Timucua Language. 
Prof. Frazer communicated to the Society a set of care- 
fully caleulated tables for common use, converting the weights 
and measurements of the metric system into those common- 
ly employed in the United States, and vice versa. 
Prof. Frazer promised to give at a future meeting the full 
details of a microscopic examination of the marks made by 
the phonograph on tin foil. 
Prof. Sadtler communicated his remarks on gas analyses 
alluded to at the last meeting. 
Prof. Sadtler communicated a paper by Dr. John Mar- 
shall, entitled “A study of some of the derivations of Mono- 
and Dichlor-Salicylic Acid,’ as a “Contribution from the 
Laboratory of the University of Pennsylvania, No. XIIL” 
Mr. Britton called attention to the forms in which Carbon 
existed in iron and steel. 
He referred to the two well-known, the combined and graphitic, and 
also to a third form or semi-graphitic. The latter he had found in poorly 
puddled metal, and also in Siemens-Martin steel, and more recently in Bes- 
semer steel rails that had not given satisfaction, and in some pig iron pro- 
duced when the furnace was working abnormally. The semi-graphitic 
form could be separated and collected by treating the metal containing it 
with dilute sulphuric or hydrochloric acid without the application of much 
heat until all the iron became dissolved, and then filtering the solution ; it 
would be on the filter, but in appearance not so black as the graphitic ; 
would have a reddish tinge, that, upon ignition would leave the ash of the 
paper white. By boiling from ten to thirty minutes all of it appears to dis- 
solve. Mr. Britton illustrated the behavior of this third form of carbon by 
producing several glass tubes, in some of which it was not dissolved in the 
acids mentioned, and in others scarcely any of it was observable after being 
boiled for twenty minutes. The existence of more than two forms of carbon 
*Mr. M. paid $2000 for this set. 
