314 TRANS. OF THE ACAD. OF SCIENCE. 
sae hate m0 for these ‘oaks, varieties fo nebiiiansda 
the two opposite shores of the Atlantic, where science first fell in with 
ir ated extre and assume for different species. 
Thus, according to Nuttall, no tenable difference is to be found between 
certain species of Poplar of Asiatic Russi 0 ian species, it 
self seemingly re variety of our Cotton — 
ame f “ 
ihe difference ~~ — st young fo orm of Cotton-wood and the 
fl bran of older individuals, as also between the fo- 
linge of Black-Oak in dierent heights of stem, are no less remarkable than 
the threefold folia; ssafras officinalis ean 
0 Broussonetia papyrifera 
kewise, where sa nceolate leaves occur e same sprout with 
one-sidedly bilobous and symmetrically trilobous ones, and a sim/lar 
variety of foliage and resembling the ravages of ca caterpillars on a leaf in 
different species of mulberry. 
_ Perhaps these diy snide’ forme all point to a process of metamorphosis 
im progress, and at any rate they show the futility of pesto specific dit 
ference on the form of the leaf alone 
Thomas Davidson, F.R.S., Sec. G: 8. of London, was elec 
ted ai correspondent. 
Messrs. fo A. Van ae and Alfred de Clausel were 
eee eerste: mem 
August 9, 1858. 
_ Letters were read from A. Fr Bandelier, F — 
a Fee tit fitee Dr. John James, Alton, ‘tL, 5th of Au 
858, : ledging receipt of copies « 2 of ther ansé 
: fons, oe enclosing the price. 
_ Dr. tie - Kennard donated for the Museum the following: a 
