  According to seminal work of Kontsevich, the unstable homology of the mapping
class group of a surface can be computed via the homology of a certain lie
algebra. In a recent paper, S. Morita analyzed the abelianization of this lie
algebra, thereby constructing a series of candidates for unstable classes in
the homology of the mapping class group. In the current paper, we show that
these cycles are all nontrivial, representing degree 4k+1 homology classes in
the homology of the mapping class group of a genus one surface with 4k+1
punctures.
