BEHAVIOR OF THE COMMON ROACH (PERIPLANETA 

 ORIENTALIS L.) ON AN OPEN MAZE. 



C. H. TURNER, 

 SUMNER HIGH SCHOOL, ST. Louis, Mo. 



TECHNIQUE. 



The maze (Fig. i) used in these experiments was constructed 

 out of a sheet of copper 13.5 inches long and twelve inches wide. 

 Each runway is one inch wide and has neither sides nor top; 

 and between each adjacent runway there is a space one and a 

 half inches wide. This maze contains four blind alleys ; two which 

 are straight (Fig. I, A, B), one which is L-shaped (Fig. I, 8 

 DE), and one which bears three culdesacs (Fig. I, 9 10 n 



C 



6 



a 



F 



9 



D 



E 



10 



11 



i i_ 



j 



2 in. 



FIG. i. A diagram of the maze used. I is the platform on which the roach 

 is placed. C is the point from which the incline departs. The numerals 1-7 

 indicate the direct passageway to C. A is blind alley I., B is blind alley II., 8 DE 

 is blind alley III. and g FG 10 n is blind alley IV. of the tables. 



348 



