10 



are raised in a more northern land. It was described in a previous 

 publication, viz : A Study of the Rice Plant produced in Formosa," 

 S. K. S. Suzuki & Y. Ogata, (Agr. Expt. Stat. Formosa, Report No. 

 10), how the Japanese varieties, "Shiratama" Q3I and '' Miyako " $j$ 

 take about 73 days for their vegetative growth and 46 days for 

 maturation, when they are cultivated at Kumamoto ^|^, Japan, 

 whereas they grow for 68 days and mature for 34 days at Taihoku; 

 that is, the northern varieties have a shortened period of growth and 

 maturation in southern climates. 



The contrary is the case with the Japanese varieties given in 

 the above Table 10. The two Formosan crops have a shorter 

 period for their vegetative growth in Shidzuoka than at Taihoku, and 

 indeed it seems very probable that these Formosan crops originally 

 belonged to varieties which were shorter lived. The temperature 

 at Shidzuoka may be a very important factor in accounting for the 

 peculiar reaction mentioned, viz : that the vegetative parts of these 

 Formosan plants grow in a shorter period. Temperature during the 

 actual crop seasons at both the places are compared in the following 

 table:-- 



