in which is shewn an easy and expeditious method of making them, superior to the best natural ones, and also, a way of improving the natural ones and of changing or converting their poles. Diretions are likewise given for making the mariner's needles in the best form, and for touching them most advantageously, etc

designed as an introduction to the higher branches of analytics : to which is added an appendix, containing a collection of problems on the nature and solution of equations of higher dimensions

a Pedestrian's Notes on their Physical Features, Scenery, and Natural History

designed for the use of students