TY  - JOUR
T1  - On a Theorem Relating to Polar Umbrae
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 12
SP  - 563
EP  - 565
PY  - 1862/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1862.0121
M3  - doi:10.1098/rspl.1862.0121
AU  - Sylvester, J.
ER  -