304 PROCEEDINGS OF SOCIETIES. 
1. General description of the ganglion-cells connected with the 
sympathetic and other nerves of the frog. 
The general form of these cells is oval or spherical; but 
the most perfectly formed ganglion-cell is more or less pear 
or balloon-shaped in its general outline, and by its narrow 
extremity is continuous with nerve-fibres which may be 
followed into trunks. 
The figure represents a well-formed ganglion-cell from a 
ganglion close to one of the large lumbar nerves of the little 
green tree frog (Hyla arborea). The substance of the cell 
consists of a more or less granular material, which by the 
slow action of acetic acid becomes decomposed, oil-globules 
being gradually set free. Near the fundus or rounded end 
is seen the very large circular nucleus with its nucleolus. 
In some of these cells, at about the central part or a little 
higher, are a number of oval nuclei, some of which are in 
connection with fibres. The matter of which the mass of the 
cell consists gradually diminishes in diameter, and contracts 
so as to form a fibre, in which a nucleus is often seen. At 
the circumference of the cell, about its middle, the material 
seems gradually to assume the form of fibres, which contain 
numerous nuclei, and these pass around the first fibre in a 
spiral manner. Thus in the fully formed cell a fibre comes 
from the centre of the cell (straight fibre), and one or more 
fibres (spiral fibres) proceed from its surface. These points 
are represented in fig. 16, Pl. IX, Vol. XI, ‘Transactions of 
Microscopical Society.’ * 
2. On the formation of ganglion-cells in the fully 
formed frog. 
The subject is arranged under the three following heads, 
but as it would not be intelligible without figures, it will not 
be given in abstract. The development of these cells and 
many other structures may be studied in the fully formed 
animal as well as in the embryo. 
a. Ganglion-cells developed from a nucleated granular 
mass like that which forms the early condition of all tissues. 
b. Ganglion-cells formed by the division or splitting up of 
a mass like a single ganglion-cell. 
c. Ganglion-cells formed by changes occurring in what 
appears to be the nucleus of a nerve-fibre. 
* The specimen from which this drawing was taken has been seen by 
many observers. 
