18 S. KIKKAWA: 
centages, until its injurious action upon the plants were clearly seen. 
In this case it was distinctly observed that the so-called salt rice had 
the strongest resisting power against the injury of the sea water among 
the rices planted together (Fig. 6). The salt rice is therefore quite 
worthy to be classified as a distinct group by itself. 
But it may be repeated that Oryza coarctata, the wild rice of the 
margins of many of the larger rivers of India, though it luxuriates in 
brackish water, is unconnected with the cultivated salt rices. 
(5) Tall and short rice. 
Among the rices of the usual height, which hardly exceed two meters, 
as I have already stated, some are taller and some shorter, The height 
of Japanese rice plants ranges from 1 to 1.7 meter and in the majority 
of cases averages from 1.3 to 1.5 meter. The writer calls those taller 
than 1.7 meter tall rice and those shorter than 1 meter short rice. Such 
classification is of use in consideration of strong winds and space to be 
given to the plants in the field. According to the writer’s examination 
of the Japanese rice plants, height has a distinct correlation with their 
tillering power and weight of the ear. In the years 1897-1900, the writer 
tried to test this correlation of many varieties, which he planted on a 
fairly good soil of the San-in Experiment Station, manured ordinarily and 
giving each seedling a space of 900 square centimeter. In their full 
maturity, the plants were harvested separately and completely air-dried 
and the number of stems and average weight of the ear of each plant 
were recorded. The result of the average of ten plants of each variety 
was as follows :— 
