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In order to examine the hypothesis of the existence of two different kinds ofnova populations in the Galaxy - 'disk' novae and 'bulge' novae - the frequencydistribution in the z-direction was obtained for 64 novae. The fact that largenumber of fast novae related to disk novae are found at a significant distancefrom the Galactic plane (up to z~3700 pc) can't result from photometricmeasurements errors. Slow novae considered to belong to bulge novae show moreclose concentration to the Galactic plane (z<1700 pc). A Kolmogorov-Smirnovtest run on the data showed that the two populations hypothesis probabilityamounts to 95.56%.

The frequency distribution of the height above the Galactic plane for the novae