Geology, Botany, Zoology. 271 
vary with those of the materials employed. Jodated propylene is a 
colorless liquid boiling at 101°C. It is rapidly colored by the action of 
air and light, and then emits very irritating vapors : its density is 1-789 
at 16°C i 
A solution of ammonia after forty hours action at 100° com- 
pletely decomposes iodated propylene ; the product is a volatile alkali, 
which according to the authors, has the formula CeHoN and ap- 
pears to be propylamin CeH7.NHe2 (?). Heated with mercury and 
ehlorhydric acid the iodated propylene is decomposed, yielding pro- 
pylene; the reaction is represented by the equation CeHsI4+-HCi+ 
4Ho—CeHe+HeeCl+Hgel. The authors recommend this process 
for the preparation of propylene. Propylene unites directly with 
iodine when the mixture is exposed to the sun’s light, and yields a 
heavy colorless liquid having the formula CeHel2; the authors term it 
W. G. 
Gordius curbonarius G. near the Nemapodia tenuissima of Emmons 
g. 1); also the coal plants Calamites transitionis 
P-» C. Rémeri Gép., Sphenophyllum furcatum Lind.—Sphenopteris 
