1 889. J Proceedings of Scientific Societies. 543 
read. April 9, 1889. Mr. Meehan made a communication on 
dogwood. — Mr. Ryder spoke further of his studies of the ver- 
tebral column. April 16, 1889. Dr. Hartzell exhibited a sec- 
tion of skin mounted in monobromide of naphthaline. — Pro- 
fessor Ryder commented on the homologies of the jaw of 
Acanthias in mammalian dentition— Dr. Rex spoke of the inter- 
est attaching to common molds and mildew. April 23, 1889. 
Mr. Wilcox recounted his own explorations of Florida with 
reference to the geology of that State.— Professor Leidy spoke 
briefly of the palaeontology of Florida. — Professor Heilprin 
gave a resume of his study of the fauna of the Bermudas— Mr. 
Ives described the ophiurans. April 30, 1889. Professor Ryder 
resumed the report of his study of the development of the 
vertebral column with especial reference to its growth in the 
May 7, 1889. An invitation from the University of Penn- 
sylvania to remove the building to West Philadelphia was 
read. — Mr. Meehan referred to his former communication on 
the formation of species of dog- wood as affected by the princi- 
ples of acceleration and retardation. — Professor Wilson spoke 
of the relation of various vegetable substances to electric fila- 
ments as bearing upon electric illuminations. — Mr. Redfield 
detailed the nature of botanical travel one hundred years ago. 
— Professor Dolly offered some remarks on Bahama plants. — 
Professor Rothrock described the sand dunes of Lewes, Del. 
May 14, 1889. Mr. Pilsbry spoke of the modifications of the 
odontophores in the Rhipidoglossa. — Mr. Ford referred to a 
new species of Helix from New Guinea, and to a group of fos- 
sil olives from Florida. — Mr. Wilcox described the habits of 
Fasciolaria gigantea from Florida. Mr. Campbell exhibited 
specimens of the genus Cyprasa illustrating the convergence of 
species. — Professor Ryder gave the results of his studies into 
the structure of the transparent tissues surrounding the eye of 
the common shad. May 21, 1889. Professor Ryder gave the 
substance of a paper on Volvox. — Dr. Rex spoke of the devel- 
opment of a species of myxomycetes, Clathroptychium rugu- 
losiun.—Vir. Wingate exhibited specimens of the genus Phy- 
sarum. May 28, 1889. The following resolution adopted: 
Resolved, That the Academy, in accordance with the recom- 
mendation of the Council, declines to accept the proposition 
made by the Provost of the University to move the institution 
to West Philadelphia.— Professor Ryder recounted recent in- 
vestigations of heterocercous fishes.— Mr. Wilcox stated that 
