250 



Ellinor Archer : 



Species. 



Control. 





Dnys. 



A, sali<^na 



2 



A. salicinia - 



2 



A. montana - 



2 



A. prominens 



2 



A. strict a 



2 



A. fiiiibriata 



2 



A. diffusa 



2 



A. neriifolia 



6 



A. lepiosa 



6 



A. Ion <'-i folia 



6 



A. rubida - 



. 



A. pycnantha 



- 



A. lonj^ifolia, var 



. sophora 



A. decurrens var. 



normal is 



A, cultriforniis 



- 



A. myrtifolia 



- 



A. dodonaeifolia 



- 





Control. 





Days. 



A. sclerophylla 



2 



A. venulosa 



2 



A. spectabilis 



2 



A. saligiia 



2 





Control. 





Days. 



A. re tin odes 



6 



A. lophantha 



G 



A. armata 



2 



A. JLiuiperina 



2 



A. verticillata 



2 



A. acinacea 



2 



A. neriifolia 



2 



A. nielanoxylon 



2 



Lead nitrate 

 J)ny8. 



Learl nitrate 



1% 

 Days. 



6 



6 



2 



2 



6 



6 



6 



G 



14 



14 



14 



14 



14 



14 



14 



14 



14 



14 



14 



14 



Control. 

 Days. 



Lead nitrate 



1% 

 Days. 



G 



14 



2 



14 • 



2 



14 



2 



G 



2 



14 



G 



14 



G 



14 



Silver nitrate 



1% 



Days. 



Lead nitrate 



i;i 



Days. 



6 



G 



(i 



J4 



(•) 



14 



J4 



14 



Lead tiitrate 



17. 



Days. 



Lead acetate 



1% 

 Days. 



14 



14 



14 



14 



2 



2 



G 



6 



6 



G 



2 



2 



14 



14 



G 



G 



111 order to prove that the solution of lead nitrate did actually 

 prevent blocking in the vessels, and allowed a freer passage through 

 the stems the following experiment was performed. 



Two short steins of as nearly as possible the same length and 

 diameter were fixed in a perpendicular position. To the upper 

 end of each was attached a small rubber tube connected witli a small 

 reservoir, while to the lower end a small graduated flask was also, 

 connected by a rubber tube. 



Reservoir A, attached to Stem A, Avas filled with water, and 

 Reservoir B, attached to Stem B, was filled Avith a 1% solution of 



