xxiv Trans. Acad. Sci. of St. Louis. 



lert Allemau, C. F. Baker, Edward H. Keiser and Albert 

 Thiele, of St. Louis; B. F. Bush, of Courtney, Missouri.; 

 George W. Carver, of Tuskegee, Alabama ; H. H. Hume, of 

 Lake City, Florida; Charles Sprague Sargent, of Brookline, 

 Massachusetts; Augustine D. Selby, of Wooster, Ohio; and 

 Stuart Weller, of Chicago. 



One person was proposed for active membership. 



November 20, 1899. 



President Engler in the chair, twenty-five persons present. 



The death of Dr. H. H. Mudd, a member of the Academy, 

 was announced by the Council. 



Dr. G. Hambach exhibited two specimens of coral presented 

 to the museum by Mr. Julius Hurter. 



Professor F. E. Nipher addressed the Academy informally 

 on Conditions existing iu solid, liquid and gaseous states of 

 matter, in the light of recent developments. 



Professor John Lane Van Ornum, of St. Louis, was elected 

 to active membership. 



December 4, 1899. 



President Engler in the chair, fifteen persons present. 



Dr. Edward H. Keiser talked informally on Some derivatives 

 of acetylene, exhibiting specimens of the new liquid acetylene 

 iodide discovered by him in January, 1899. He described the 

 methods of making the compound, and gave an account of its 

 chief physical and chemical properties. The liquid acety- 

 lene diiodide solidifies at —21° C. and boils at 185". It has the 

 percentage composition and molecular weight represented by 

 the formula C2H2I2, and is isomeric with the well known 

 solid acetylene diiodide. The speaker announced the discovery 

 of a new method of making the liquid acetylene diiodide, 

 namely, by heating the solid compound to 260*^ in a scaled 

 tube. The solid compound is thereby partially converted into 

 the liquid compound. Similarly, if the pure liquid diiodide 

 be heated to 260'' in a sealed tube, on cooling down, the liquid 

 will be found to have been partially converted into the solid 



