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3. 

blades, spear-heads, scrapers, axes, spurs, fish-hooks, etc. Being in a high state of oxidation, they had become so fragile that they could no longer be handled with safety. I therefore immersed them in a solution of thin glue and bi-chromate of potassium, in consequence of which they have become entirely solidified. This necessary, but very disagreeable, work lasted several days. Of the 601 arrow-heads from Oregon, obtained from Drs. C.A. and J.A. White, 400 were mounted on 20 large blocks, each holding 20 specimens. They form perhaps the finest collection of arrow-heads in existence. The remaining unmounted specimens are more or less fractured, but still will make good material for exchanges. The supply of exhibition trays being entirely exhausted, it was fortunate that in the course of this month 350 new ones were received in this Department. 

Smithsonian Institution, Dec. 2, 885.

C. Rau,
Curator.

Professor S. F. Baird.