iS 



E. L. TIIORNDIKE. 



3muv.' 



io$u.-l 



Scale. 



No. lOU^D. 



^- No. 10 uv^^. ^ 





H '*f 



hi. 



7^. 



No.n Ov^D. 



tVo.3i;s,\ '^* 



T — r 



No] 3 ^ A. 



Fig. 2. 



