150 THE AMERICAN MUSEUM JOURNAL 
DEPARTMENT OF PREPARATION AND INSTALLATION. 
aE present with this number illustrations of the en- 
Al larged models representing the anatomy of the 
common oyster and clam, which have been pre- 
pared by Dr. B. E. Dahlgren, Curator of the 
Department, and placed on exhibition in the 
Synoptic Hall, No. 107 of the ground floor. These models are 
about seven times natural size, and show very clearly the names 
and functions of the different parts of the animal. 
CLAY MODEL OF POLAR BEAR GROUP 
The preparation of a large group to represent the Polar Bear 
in his native surroundings has been begun by the Department of 
Preparation and Installation. It may interest our readers to 
know that the first step in the actual preparation of such a 
group is the making of a complete model in clay, which repre- 
sents not only the background, but also all the animals in the 
position and attitude which they will occupy in the completed 
work. A photograph of such a preliminary model of the Polar 
Bear group is reproduced herewith. The animals here utilized 
were captured on some of the Peary Arctic expeditions. 
Several striking and instructive models in glass, wax and 
other materials have been placed on exhibition in the Synoptic 
