22 
CENTRAL HALL. 
museum, but also as a guide to a method of arrangement which 
may be adopted in institutions with limited resources. 
Among the illustrations of the order Primates is placed the 
skeleton of a young Chimpanzee dissected by Dr. Tyson, 
which formed the subject of his work on the " Anatomy of a 
Pigmie," published in 1699, the earliest scientific description 
of any man -like ape. 
Integmnent The central case of this bay contains illustrations of the 
outer covering or integument and its modifications in the class 
of Mammals, divided into the following sections : 
1. Expansion of skin to aid in locomotion, as the webs 
between the fingers of swimming and flying animals, the para- 
chutes of flying animals. 
2. The development of bony plates in the skin, found among 
mammals only in the Armadillos and their allies. The cast 
of a section of the tail of a gigantic extinct species 
{Glyptodon) shows a bony external as well as internal skeleton. 
3. The outer covering modified into true scales, much resem- 
bling in structure the nails of the human hand. This occurs 
in only one family of mammals, the Pangolins, or Manidce. 
4. Hair in various forms, including bristles and spines. The 
two kinds of hair composing the external clothing of most 
mammals, the long, stiffer outer hair, and the short, soft under- 
fur, are shown by various examples. 
5. The special epidermal appendages found in nearly all 
mammals on the ends of the fingers and toes, called according 
to the various forms they assume, nails, claws, or hoofs. 
6. The nasal and frontal horns of the Ehinoceroses, shown by 
sections to consist of a solid mass of hair-like epidermic fibres. 
7. The horns of Oxen, Goats, and Antelopes, consisting of a 
hollow conical sheath of horn, covering a permanent projection 
of the frontal bone (the horn-core). 
8. The antlers of Deer, solid, bony, generally branched, projec- 
tions, covered during growth with soft vascular hairy skin, and 
in most cases shed and renewed annually. 
Against the wall at the back of the bay is a case containing 
a series showing the changes in the dentition of the Horse at 
different ages. Above this is arranged a series of antlers of the 
Stag or Red Deer {Cervu.s daphus), grown and (except the last) 
