134 SENSORY RECEPTORS 



Exercise XXVI 



EQUIPMENT 



Per laboratory 



safety razor 



filter paper 



1% quinine sulfate 



5% sucrose 



10% sodium chloride 



1% acetic acid 



onions and apples 



frog 



pan balance 



Per pair of students 



bristle 



dividers 



2 125-ml Erlenmeyer flasks 



marking pencil 



pipet 



2 500-ml flasks 



sheet of white paper 



3" X 5" white card 



