Ixxxiv Proceedings of the Botanical Society 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. 



