Short period variable stars IV: Periods of Delta Scuti stars.

A method of analysing short and non equl-spaced light curves is described and used to study all the published photometric data of Delta Scuti stars. A set of homogeneous results on periods is given, but of 34 stars studied, four are called "Delta Scuti" on very pcor basis and nine exhibit more than 30 minutes difference between the different determinations of periods. Key words: Delta Scuti stars