632 Proceedings of the Royal Irish Academy. 
HOH, ClOCl, HOCl, &c., lie compares to planets with two satellites ; 
quaternary compounds, sucli as II3N, he regards as planets with three 
satellites; quinary compounds, such as II4C, are planets with four 
satellites, and so on. 
It is my intention, in these notes, to follow up IS'ewtonian 
principles to their legitimate consequences in certain well-established 
chemical combinations, and to test the conclusions to which they 
lead with well-known chemical facts ; if, in the course of these 
calculations, we are led to conclusions at variance with chemical 
facts, then the hypothesis of Newtonian Chemistry must be set aside, 
and some other mode of motion, better fitted to explain the facts, 
be adopted. 
Binary compounds are molecules consisting each of two atoms, 
which may be the same or di:fferent, such as 
HH, ClCl, HCl, HI, &c. 
Of these, I shall discuss in the first place, HH, ClCl, HCl, as 
their chemical and physical properties are well established: — 
1. The Syd/rogen Molecule. — This I represent by two atoms of 
hydrogen revolving uniformly in a circle round C, their common centre 
of gravity. 
Fig. 1. 
If IX denote the coefficient of attraction, at unit distance, for 
unit masses of hydrogen, I the radius of the orbit, a the mass of 
