318 



DR. L. H. GOUGH. 



exportation abroad, for planting. Table XXVI, taken from Mr. Storey's report, 

 shows that temperatures of from 60° to 70° C, and in most cases up to 73° C, are 

 not fatal to the germination of the seed. The only significant decrease of germina- 

 tion shown in this table was found in samples 8 and 23. 



Table XXVI. — Tests of Samples treated at Temperatures varying between 



53°C. and 73PC. 



Serial 





Percentage 



Percentage 



number 





mortality of 



germination 



of 



Temperature reached after treatment. 



Gelechia 



of the 



sample. 





larvae. 



seed. 



1 



73° (rejected) 



100 



88-6 



2 



54° (retreated) 



100 



930 



3 



Control 



19 



930 



4 



70° (rejected) 



100 



88-S 



5 



65° (treated for second time) 



100 



9 13 



6 



70° (rejected) 



100 



87 5 



7 



69° (treated for second time) 



100 



89-5 



8 



71° (rejected) 



100 



65-0 



9 



63° 



100 



95-6 



10 



61° 



100 



94-2 



11 



65° (treated for second <ime) 



100 



930 



12 



64° 



100 



960 



13 



65° 



100 



95-8 



14 



67° 



100 



90-2 



15 



59° (treated for second time) 



100 



939 



16 



72° (rejected) 



100 



91-4 



17 



Control 



50 



97 4 



18 



Control 



33 



88-1 



19 



64° 



100 



875 



20 



73° (rejected) 



100 



88-6 



21 



66° 



100 



963 



22 



64° 



100 



91-4 



23 



73° (rejected) 



100 



30-1 



24 



Control 







93-2 



25 



60° 



100 



95-6 



26 



67° 



100 



94'1 



27 



68° 



100 



91-7 



28 



66° 



100 



96-1 



29 



64° 



100 



88-4 



30 



72° (rejected) 



100 



86-9 



31 



59° 



100 



93-1 



32 



66° 



100 



92-9 



33 



68° 



100 



85-9 



34 



63° (treated for second time) 



100 



90-4 



35 



73° (treated for nth time) 



100 



79-9 



36 



Control 



30 



92-7 



There appears to have been no difficulty in controlling the machines at any of 

 the seven ginneries which treated seed last winter. Temperature regulation was 

 fairly easy, and the difficulties anticipated by some people did not materialise. 

 In view of the perfect results obtained with the seed treated at 65°-69° as to germination, 

 and more especially as to the greater safety in worm-killing, it will be advisable in 

 future for ginners employing heat treatment to work their machines for temperatures 

 of 60° C. to 65° C, rather than for 55° C. to 60° C. 



