PHILOSOPHICAL TRAJSrSACTIONS 
OF THE 
EOYAL SOCIETY OE LONDON 
Series A, VOL. 201, pp. 223-327. 
QUATERNIONS AND PROJECTIVE GEOMETRY 
BY 
Professor CHARLES JASPER JOLY, 
ROYAL ASTRONOMER OF IRELAND. 
LONDON: 
PUBLISHED FOR THE ROYAL SOCIETY 
BY DULAU AND CO., 37, SOHO SQUARE, W. 
CONTINENTAL AGENTS, MESSES. FRIEDLANDER AND SON, BERLIN. 
1903. 
A 338. 
'ice Five Shillings. 
20.6.03 
