Ixxxiv Proceedings of the Botanical Soctety of Penna. 
He showed how the veining often differs in closely related 
groups or species of fern, and how the sori are disposed in 
the leading native and tropical genera. The speaker then 
drew attention to a large set of living ferns from the green- 
houses of the department, and which illustrated many of the 
points already treated of in his communication. 
