An opportunity that no one ought to miss, to learn'about this famous observatory, will be afforded at the First Baptist church, on Friday evening next. By special invitation Professor W. W. Campbell, of the University, spent the last summer vacation there and took part in the daily observations. He has consented to give a descriptive talk, fully illustrated by stereopticon views of the observatory, its instruments and celestial objects as seen throughthe greatest refractor in the world. He will also show some photographs of Californian scenery near Mt. Hamilton and San Tose.