412 Scientific Intelligence. 
railway bars, which from their softness and lamellar texture soon become - 
bout 
more difficult to roll, its cost per ton may fairly be considered to be the 
same as iron; but, as its tensile strength is some thirty or forty per cent. 
greater than bar-iron, it follows that for most purposes a much less weight 
of metal may be used, so that, taken in that way, the semi-steel will form 
ordinary pu 
1 n some Dichromatic Phenomena among Solutions, and the means 
of representing them ; Dr. Guapstorx, (Proc. Brit. Assoc. Augus 
ditions, cochineal, and chromium, and cobalt salts were examined and 
represented. Among the more notable results were the following :—A 
, such as chromic oxyd, produces ve nearly the same spectral im- 
—_ maintained that a large amount of alkaline litmus is of a purer red 
than acid litmus itself. nother kind of dichromatism was Csiuiail 4 
