1869.1 397 [Hoy. 



from the ground, the bird on the nest. I climbed the tree and dis- 

 covered three eggs, which were not molested; the next day I visited 

 the locality and found the bird on. After this Ozahu passed by the 

 tree every morning and evening, and never failed to notice the long 

 tail of the hawk projecting over the nest. On the 27th he climbed 

 the tree, and found five eggs. In emptying the eggs I was careful to 

 note ifiat one was fresh, the balance in various stages of incipient 

 incubation. In not a single Instance was a nest visited without find- 

 ing the parent bird occupying the nest. Tlaese facts, In connection 

 with the various conditions in which I found the contents of the eggs, 

 warrant me in saying, without a shadow of doubt, that Cooper's 

 Hawk continues to occupy her nest as soon as she commences to lay. 

 These nests were composed of sticks, rudely lined with strips of 

 bark and a few bunches of lichen (^Usnea barbata). The nests were 

 quite shallow and rather small for a hawk. The eggs were sprinkled 

 sparingly with umbre brown. The eggs procured from the last nest 

 were also blotched with bluish green, which was conspicuous while 

 the eggs were fresh, but has now nearly faded out. While the 

 nests were being molested, the parent hawks would fly from tree to 

 tree, keeping well out of gunshot the while, uttering in rapid succes- 

 sion " gulck-guick, guick-guick," almost precisely like the call of the 

 golden-winged woodpecker. The male bird, during the nesting sea- 

 son, is frequently seen high in air, sporting, vaulting and turning 

 somersets on the wing, which habit has given it the name of Tumbler 

 Hawk. No hawk is harder to shoot, and none commit greater havoc 

 among the barnyard fowls than Cooper's Hawk. I saw one strike a 

 large hen while she was flying wildly for safety and kill her on the 

 spot ; but the hawk was obliged to abandon the game as It proved too 

 heavy. 



Section of Microscopy. April 14, 1869. 

 The Curatoi- in the cham Thirteen members present. 



Dr. H. Hagen remarked that he had recently received a 

 communication from Dr. Benecke, stating that a young and 

 still unknown optician, Mr. Gundlach of Berlin, had suc- 

 ceeded in making more powerful and much cheaper object- 



