214 
Dr. Ktdd's observations 
about one-sixth of its weight of the peculiar concrete sub- 
stance, which will be described in the next section : by the 
assistance of heat, dissolves about one-third its own weight of 
that substance. 
Readily catches fire upon the application of flame, and 
emits a very great quantity of smoke while burning. 
By agitation mixes temporarily with water at the common 
temperature ; from which however it soon separates like 
oil. 
Slightly soluble in boiling water ; but in cooling is de- 
posited so as to give a milky appearance to the water, which 
remains perfectly transparent while at or near the boiling 
point. 
Unites readily with alcohol and with ether at all tem- 
peratures. 
By agitation with an aqueous solution of potash, or of 
ammonia, it communicates a slight wheyishness to those 
fluids; but soon separates from and floats on the top of 
them. 
Absorbs several times its volume of ammoniacal gas, with- 
out any sensible change. 
Absorbs also several times its volume of muriatic acid gas ; 
becoming, in consequence, opaque and thick. 
Forms a uniform white soapy curd with a solution of 
acetate of lead, by the intervention of an aqueous solution of 
potash or of ammonia ; but, if simply mixed with the me- 
tallic solution, it soon separates without any sensible change. 
Properties oj the white concrete substance. 
Taste, pungent and aromatic. 
