The ninth decade of Dr. F. Von Mueller's treatise on the "Gum Trees of Australia" is on our table. The kinds figured this time are cornuta, exima, Foelscheana, Howittiana, patens, Salmonophloia, salubris - this is one of the most abundant oil-bearing species, and Dr. Mueller thinks, one of the most valuable medically of all the genus - tereticornis, tessellaris, Todtiana. Dr. M. finds great specific differences in the cotyledons, and there is in this part an illustration of many species, showing these peculiarities.