An account of another small treatise, written in the High-Dutch and printed at Bazil, Anno 1681. Containing a new theory about the comets, invented by James Bernoully, the title whereof is thus expressed: A new introduction, shewing how the motions of comets may be reduced to some certain and geometrical rules, so that their appearance may be predicted.

Before he cometh to explain his Theory, he thinks it very convenient to say something of the Original cause of Comets, of their course and motion, of their place and tail.