48 



Position of Plants in Shed. 



The pots containing the plants were placed in two rov/s in the 

 long shed as shown below\ 



Qn^A.^^ r ^Fi- ^"2. I3. P4. P6. P/. F8. F9. Pio. Pll. 

 blACK u. ^ pj^^ p2^^ p,,^ p^.j p^-^.^ p^.,^ pg^ p^,^ Pjo^ pj^a^ 



F. Ficus Elastica (Rambong) 

 P. Hevea brasiliensis (Para) 



I. Inga Saman or Pithecolobium Saman (Rain tree). 



The length of the shed was about 12 yards, the first two plants 

 nearest the stack being 3 yards from the stack, and the others being 

 placed approximately equidistant from each other along the whole 

 length of the shed. 



Results of Investigation. 



The first results of the experiment on the plants was observed 

 two days after the experiment was completed, no effects being 

 observed prior to this. 



I he following observations were made on the respective plants : — 



(i) Observations on third day. 



Fl. One leaf stiff" and of a dull green colour. 



Fia. Several leaves yellow and brown in colour and one dropped 

 on touching. Two twigs had also dropped oft". Eight 

 leaves dropped off" and nine left intact. 



P2. Two leaves yellow. 



P2a. Three leaves easily detached on touching. A large num- 

 ber had become yellow in colour. 



I. 3. A number of branches and leaves quite dry and broke off 

 on touching. 



P3a. Many leaves brown and unhealthy in appearance. 



P4. This was a small plant with only eight leaves. All were 

 badly affected and had a yellowish white colour. 



P4a. Half of the leaves (15) had turned a yellowish white colour. 



I. 5a. One branch dropped- off on touching. Remainder healthy. 



P6. Six leaves dry and of an unhealthy appearance. 



P6a. All leaves healthy. 



P7. Four leaves had turned yellowish in colour. 



F/a. No apparent effect. 



F8. „ 



FPa. Three leaves had dropped and seven were yellow and 

 unhealthy. 



