15 - 



to the too slow movement of the seed, individual seeds ha\e been 

 overheated through being kept too long in direct contact with the 

 steam-jack' 



Our second <|iiestion \ve can now answer as follows. Provided 

 that neither the whole mass of seed nor individual seeds are heated 

 to a higher temperature during the treatment, wet seed can safely 

 be raised to a temperature of (>0 (.'.. and dry seed to a temperature 

 of at least <>.'>"('. without damaging the germination. Further, seed 

 at these temperatures can safely lie sacked in spite of the very slow 

 rate of cooling of cortim -red in bulk. 



Before passing on to n consideration of the various types of 

 machine proposed, thci i'l-w minor questions of general interest 



to be dealt with. In the first phice. as MIOH as the rr.estion of actually 

 erecting the machines in the ginneries arose, it wa>' immediately 

 asked whether the machine could be placed between the gins and 

 the sifters.* so ;is to treat all the seed together instead of having 

 to make separate arrangements for the sifted seed ;md the seed from 

 the all'rita-gins.* The great advantage of this arrangement is 

 obvious, hut two objections tave been raised to it. Firstly, it has 

 been suggested that the seed in IHII/H-HIHH* cotton which has pa- 

 through the gins may not get sufficiently heated owing to the insulating 

 action of the cotton fibre. And secondly, it has been urged that if 

 the heated seed goes direct from the machine into the sitters, the 

 seed will be rapidly cooled and the full effect of the heating will not 

 be obtained. 



In order to test the first of these points, experiments were carried 

 out with Simon's machine on two occasions. On the first occasion 

 the mortality of the pink boll worm was as shown below : 



"iUl ti, 



inor> ' in M t,'ll,-,l IIIMSS round tlir I. ^urh lorks of c 



i i- \\ il ti 1 li>- SIMM!, from 



whii-li ili\ edbythe ''! into s|, ' 



uhii'li ti'iir (linn ii|, nnil -c|initi- tin- linl from tlir - I. 



