Pankhurst has described a band spectrum believed by him to belong to an oxide of silicon, possibly SiO2. A better excitation of the same bands has been obtained from a similar source (a high voltage uncondensed discharge through a constriction in a quartz tube), but in helium gas instead of hydrogen. These bands have been photographed on the 30-foot, 30,000 lines per inch Chicago grating spectrograph. A band near λ3840 has been resolved in the first and second orders and found to be a (0,0) transition, overlapped by a weak (1,1) transition, of the type 2Σ-->2Σ, having the constants ν(0,0)=26,015.05 cm-1,ν(1,1)=25,991.44cm- 1,B0'=0.7180cm- 1,B1'=0.704cm- 1,B0''=0.7253cm- 1,B1''=0.712cm-1. The coefficients of the spin doubling for the two states are γ0'=+0.012 cm-1, γ0''=+0.002 or γ0''=+0.022 cm- 1, the value of γ0'' not certainly fixed as between these two alternatives. The doublet structure and the B values prove that the emitter is SiO+. Other bands at λ4270 have been resolved with weak intensity and tentatively ascribed to SiO2.