LABORATORY GUIDE IN PHYSIOLOGY. 



square. Determine now the form perimeter, i. e., the 

 limits of the field within which a circle can be defi- 

 nitely differentiated from a square or triangle. 



Chart the form-perimeter, i. e., transcribe the peri- 

 meter upon the record chart. Is it similar in general 



FIG. 33. Perimeter chart for recording the limits of indirect vision for 

 light, for color, and for form. 



form to the light perimeter ? Is it much smaller in area ? 

 Determine and chart various color-perimeters : (a) 

 yellow; (b) red; (c) green and (d) blue. 



