406 Scientific Intelligence. 
time. This is made alkaline again, and the operation is repeated 
‘as long as the solution becomes acid. On distilling off the 
methyl alcohol, the liquid solidifies to a mass of yellowish colored 
erystals of orthotrimethylphenolammonium hydriodate. e 
base is obtained from this by treatment with silver oxide, in well 
formed prisms, having the formula C,H,,NO, or CH (CH) 
Several salts of this new ammonium are described, beside the plati- 
num double salt. By treating paraamidophenol in the same way, 
Che 
ap Geissler tube at a pressure m when single 
induction sparks are discharged through it, Vogel concludes that 
their existence i due alone to very high temperatures, as 
according to Lockyer, longest lines disappears, while many 
weaker and less refrangible lines remain. i r : 
lines increase in brightness, but many disappear. The assertion 
of Lockyer, that with diminishing pressure the shortest lines dis- 
appear first, is therefore not true in general.—Ber. d. Berl. Ak., 
1879, p. 586. J.T. 
8. Lhe limits of the Ultra Violet in the Solar Spectrum at dif- 
Serent heights.—Cornu has made some spectroscopic tests on the 
slightly increased with the altitude of observation. The, change 
of wave-length is about a millionth of a millimeter for 700 ee 
The limit at the Riffel was reached at a wave-length of 293°2, 20 
consisted essentially of a Savart polariscope mounted upon 4 div 
Ree eS 
