At an open night at the Harvard College Observatory this evening, F. S. Hogg will lecture on. "The Depths of the Universe," under the auspices of the Bond Astronomical Club at 7.45 o'clock.

Admission is by ticket only, which may be obtained by sending a self-addressed, stamped envelope to "Open Nights," Harvard Observatory, Cambridge.

The talk will be followed by telescopic observations, if the weather permits, and exhibits showing the work of the Observatory will be explained by members of the Club.