LGS 3 presents the optical appearance of a dwarf spheroidal galaxy, bu
t has a significant neutral hydrogen component. Photometry of its brig
htest stars with COSMIC at the prime focus of the Hale telescope shows
a 10(8)-yr-old population and a 10(10)-yr-old population. Either we a
re seeing a recent burst of star formation in a dwarf spheroidal galax
y, or, if intermediate-age populations are also present, we are witnes
sing a recent transition from a dwarf irregular to a dwarf spheroidal
galaxy.