THE JACKSONIAN OOLOGICAL CCLLECTION. 
Sip. W. Jackson tree climbing with tree-irons or spurs, at Chatswood, Sydney. When collecting in the Clarence and 
Richmond River districts of N.S.W., the spurs were frequently brought into operation, being found very useful, but of course 
only in cases where the tree was not too thick, and the climber was enabled with safety to obtain a firm hold. 
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