30 MARCH 1889, Page 43

tion of Professor Rosenbusch's exhaustive work on rock-making minerals. It

has been carefully abridged so as to retain only matter really necessary to the exact student, who will find in its somewhat technical language that thoroughness which belongs to German science. There aro upwards of one hundred and fifty- six photo-micrographs of minerals in a series of twenty-six plates, which are as good as photo-micrographs generally are, and several woodcuts. If possible, we should have liked to see woodcuts of all the minerals mentioned in the text. Still, the morphology, the chemical and physical properties, and the specially mineral part, form altogether a valuable reference and teaching volume.