Director'' s Anmial Report. 



15 



installed in the lyaboratory that have, so far, given great satisfac- 

 tion, and the birds have been placed therein. 



The unit is of No. 16 enamelled steel 3x3x2 feet outside 

 measurement. The doors open to the full width of the interior 

 and fold back fiat as shown in Fig. 4. The doors close on surface 

 of prepared fabric and are secured by Jenks locks with bolts top 

 and bottom. These cases are placed on wooden racks, light but 



Falconidse 



Circus hudsonius 

 Buteo solitarius 



Corvidae 



Corvus hawaiiensis 



Heterorhynchus 

 xanthophrys 



Corvus 

 hawaiiensis 



exceedingly stiff and strong (Fig. 3), serving to keep the cases 

 from contact with walls or floor and permitting removal of any 

 unit without disturbing its neighbors. The trays are of the same 

 metal in two sizes, supported on triangular runs 2.2 inches apart, 

 welded to sides. For the single cases the dimensions are 22x32.7 

 inches with a depth of 1.7 inch; the smaller size trays for the 

 double cases are 22 x 15.5 inches. The gauge of the larger trays 

 is No. 20; of the smaller. No. 24. The double cases have a par- 

 tition in the middle, each half with its own door. The bottoms of 



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