D. Appleton and Company have added to their Home Reading Series _The Earth and Sky_, a primer of Astronomy for Young Readers, by Prof. _Edward S. Holden_. It is intended to be the first of a series of three or more volumes, all treating of astronomy in one form or another, and suited for reading in the school. The treatment is based on the principle that "it is not so simple as it appears to fix in the child's mind the fundamental fact that it is Nature which is true, and the book or the engraving which is a true copy of it. 'It says' is the snare of children as well as of their more sophisticated elders. The vital point to be insisted on is a constant reference from words to things." The volume is written as a conversation with a young lad. He is first shown how he may know for himself that the earth is not flat, though it certainly appears to be so. The next step is to show him that he may know that the earth is in fact round, and that it is a globe of immense size. Its situation in space is next considered, and the child's mind is led to some formal conclusions respecting space itself. It is then directed to the sun, to the moon and its changes, to the stars and their motions, to the revolution of the earth, etc. In 1887 _E. S. Holden_ published through the Regents of the University of California a list of recorded earthquakes on the Pacific coast, it being the first systematic publication of the sort. The purpose of it was to bring to light all the general facts about the various shocks, and enable studies to be made of particular earthquake phenomena. It was necessary at the Lick Observatory to keep a register of the times of occurrence of all shocks on account of their possible effects on the instruments. With this was associated in 1888, when the observatory began its active work, the collection of reports of shocks felt elsewhere on the Pacific coast. Mr. Holden now reprints this pamphlet through the Smithsonian Institution in _A Catalogue of Earthquakes felt on the Pacific Coast, 1769 to 1897_, with many corrections and additions, including a complete account of the earthquake observations at Mount Hamilton from 1887 to 1897, and an abstract of the great amount of information that has been collected regarding other Pacific coast earthquakes during the same interval.