Part of the botanical collections are exhibited in the gall- 
cry of plants on the second floor, in the southwestern corner of 
the museum. The Herbarium, in the mezzanine, contain 
150,000 species of plants systematically arranged and ready 
for consultation by students. It is one of the largest herb- 
aria in North America. 
The mineralogical collections are exhibited on the first 
floor inthe Gallery of Geology and Mineralogy. The reserved 
collections are on the third floor. The minerals include the 
celebrated Jefferis Collection purchased by Mr. Carnegie. 
This collection contains many specimens orginally figured in 
Dana’s “Mineralogy.” One of the exhibits in this gallery is 
the group of stalactites and stalagmites obtained at Naginey, 
Pennsylvania. 
The paleontological collections are among the most ex- 
tensive, beautiful, and famous in the world. The mounted 
vertebrates are on the first floor. The invertebrates are on 
the second floor. 
The collections include the great Bayet Collection, con- 
taining 120,000 specimens, being the largest and best collec- 
tion representing the fossil fauna of Europe to be found in the 
New World. It has been said that “to study the mammals of 
the Miocene and the reptiles of the Jurassic one must visit 
Pittsburgh.” Among the striking objects are the skeletons of 
Camarasaurus in the matrix, found in the National Dinosaur 
Monument in Utah, of Apatosaurus louisae named in honor 
of Mrs. Carnegie, and of Diplodocus carnegiei, named in 
honor of Mr. Carnegie. Copies of the latter have been 
presented to the National Museums of England, France. 
Germany, Russia, Austria, Italy, Spain, and Argentina. 
Portions of these collections are placed in the gallery of 
avian anatomy already alluded to, and in the gallery of ver- 
tebrate anatomy, the latter adjoining the gallery of mam- 
mals. There are thousands of specimens. 
The exhibits occupy almost the entire space on the third 
floor. Here is the largest collection of Costa Rican antiqui- 
ties in the world. Here are large collections representing 
various North American tribes from Alaska to Panama: 
collections illustrating the manners and customs of the ab- 
original people of the South Sea islands and of Africa.