630 R.-W. SHUFELDT 
In this article, and referring to the slab of Archaeopteryx sie- 
mensit (Berlin slab), Professor Vogt says: 
There remain the feathers. Here, no doubt, these are birds’ feathers, 
with a median shaft having barbs perfectly formed. ‘The horny substance of 
Fic. 2.—Archaeopteryx siemensii. By the author after Carl Vogt. Known as 
the ‘‘ Berlin specimen.’’ Considerably reduced. 
the feathers has vanished, but the model in the fine paste of the lithographic 
stone is so perfect that the smallest details may be studied with the lens. The 
new slab shows all the feathers in their place. 
