3I 
138. PYRAMID CELLS IN THE CEREBRUM OF TADPOLE. Pre- 
pared by the “ rapid Golgi method.” 
139. SPINAL GANGLION NERVE CELLS OF A CHICK, seventh day 
of incubation. They are seen to be in the primitive bipolar 
condition, each with one process entering the spinal cord (on 
the right), and the other proceeding in the opposite direction 
towards the periphery. Prepared by the “ rapid Golgi method.” 
140. SPINAL CORD FIBRES OF A CHICK. Horizontal section 
through the same cord, showing the bifurcation of the posterior 
root fibres as they enter the cord. They appear like very wide 
Y’s. By the “rapid Golgi method.” 
141. SPINAL CORD CELLS OF A CHICK. Transverse section 
through the same cord, showing some of the ependyma cells. 
lining the central canal and sending long processes through the 
cord to its periphery. Also showing their cilia projecting into 
the central canal. By the “rapid Golgi method.” 
142. SPINAL CORD CELLS OF AN EMBRYO PIG. Prepared by 
means of the “ mixed Golgi method.” 
143. CORPUS DENTATUM, section through the. Showing the 
arrangement of its nerve cells and fibres. Eight-months’ human 
embryo. Rapid Golgi. 
144. AXIS-CYLINDERS. Showing their varicosities. Cerebellum 
of an eight-months’ human embryo. Rapid Golgi. 
145. NERVE CELLS IN THE OPTIC THALAMUS. Ejight-months’ 
human embryo. Rapid Golgi. 
The preparations are accompanied by explanatory photo- 
graphs or drawings. The photographs (some of which are 
kindly loaned by Dr. M. Allen Starr) were taken by Dr. 
Edward Leaming, who will also show transparencies of the 
same. 
Exhibition of Embryological Specimens. 
By Bashford Dean (Biological Department, Columbia College). 
146. EMBRYONIC DEVELOPMENT OF THE GAR-PIKE (Lefidosteus 
osseus). A series of specimens of embryonic and larval stages 
obtained at Black Lake, St. Lawrence Co., N. Y. 
