ith. regard to temperature, the resiiLts reported 

 in this paper irtilcate that any inaintained temperature 

 between 28° and 31o C. may be expected to give about the 

 maximum rate of shoot elongation fbr such seeds as these. 

 For a very rapid rate of germination and subse- 

 quent growth of shoots until the latter, are 4-5 em. long a 

 teKperatvir e of 29° C. m.ay be selected v/ ith a solution. as 

 for example^ IR332 (0.1 atm. ) ^ Under these conditions, it 

 should require about 25 hours, to obtain (from seed lilce 

 that here used) seedlings having a shoot length of 4 cm. 



after the shoot has broken through the seed-coat, and 



^^laced 

 about 95 hours after the dry seed has beeii m contact v/ith 



the solution. 



These recommendations are based on the svipposition 



that it is desirable to secure about the most rapid 



development of shoots during their germination phase. If a 



slower development is requisite, probably most physiologists 



;"ould agree that it would be better to retard grov.th by using 



a temperature somewhat belov; the optimum rather than above it. 



maintained 

 Prom the graphs of figure 1, a/temperature may readily be 



chosen, such Lhat any desired rate of shoot elongation may 



be approximated, .hether it is desirable, in preparing 



seedlings for solution cviltures,to allow gei^niination to 



occur under nearly optimal ccnditions, cannot be stated. 



