22 



Fundamentals of Auxin Action 



racks of 10 or 12 for each treatment. If these items are not available, 

 the seeds may be planted in small wooden troughs filled with sand. 



3. Decapitating scissors (A) and cork-lined tweezers (B) (figure 

 8) are very useful in setting up the test. 



A B C D E 



Fig. 8. Tools for the Avena test. A, decapitating scissors; B, tweezers with cork 

 lining; C, mold for cutting agar; D, guide for cutting 12 agar blocks; E, spatula for 

 placing agar blocks. 



4. A special cutting mold (C), a guide for dividing the agar into 

 uniform blocks (D) and a small spatula (E) are convenient for the 

 steps involving the agar (figure 8). 



5. Shadowgraph apparatus as shown in figure 9. If this apparatus 



Light 

 Source 



with 

 Apertures 



Block t 

 Photographic Paper 



SCALE' 



one foot 

 Fig. 9. A box for taking shadowgraphs of the Avena test. 





