288 



TA\T.OR— ON THE PRODUCTION OF 



[ength ef 



Internoae 



in 



millnetert 



/ GRRPH I- nCEPLt PUnCTURE 



n- PISTILLEP WRTER 

 Hr-UTHlUn CRRBOriRTE 



90 



eo 



70 

 60 

 £0 

 40 

 30 

 20 

 10 

 



0--0 



I 



-=^rZ 



'CSGSJfI>- 



Tnternoda bolov Injection Q 

 Xntarnede Injaofd. 0~~ 



Intsrnoda above Injection Q- — — — — ^ 



The first date given t» that 

 upon which th9 Injeotton was luidtf. 



Mea$itrement» made lote in i/te 

 $uaKtr afiou no jiroittfi ooer that 

 ahott/n tn thgse graphs. 



Discussion of the Graphs — Polygonum 

 Needle Puncture Controls 

 In addition to untreated plants, a series was run on plants that had 

 been punctured as if making an injection, and the wounds similarly 

 protected with grafting wax. It will be seen that the punctured internode 

 is longer than the internode below, as in the normal stem. Compare 

 with the injected specimens. Specimens 57, 58, 59, 60, 61. 



Distilled Water Injections 

 The injected internode is seen to be the shortest of all. The plants 

 seem to have averaged somewhat older than the preceding. Specimens 

 62, 63, 64, 65, 66. 



