This article contains a brief account of the Mount Wilson spectrograms of P Cygni, an old nova of spectral type Bep, whose atmosphere is still moving outward. The dispersion of some of the spectrograms is higher than that previously used for this star. No major changes in the general character of the spectrum have occurred since 1887. Numerous bright lines have yielded the same radial velocity, about -13 km/sec, since 1899. Dark lines of various elements have quite different shortward displacements. Moreover, the stronger dark lines are subject to interesting variations in intensity and structure. At times the dark hydrogen lines are double, indicating the simultaneous presence of two shells expanding with different velocities. Components with velocities outward from the star of 150 and 220 km/sec, respectively, were measured on several plates. Tracings of various lines and summaries of measured displacements are included.