On the Development of the Plumule and Radicle of 

 Rice-Seed with Various Quantities of Water 

 in the Germinating Medium. 



BY 



T. Yokoi, A^flgakiishi. 

 Professor of agricullnre. 



mill Plalcs XVI— XVU. 



It has already been shown by F. Haberlandt that some kinds of 

 seed germinates under water deprived of air.* Our experiments 

 have also shown that rice seed is one of them. Indeed, rice seed 

 germinates freely under water with oi without air. Yet it has been 

 observed that in the case of germination under water the plumule 

 alone elongates long before the radicle appears. It has also been 

 observed in the case of other grains, that in media with different 

 quantities of moisture the plumule and the radicle develop in 

 different proportions. 



To show the matter clearly I allowed lO grains of rice to 

 germinate under water and on sand with different quantities of 

 moisture. The sand selected was found on examination to have 

 the water holding capacity of 31.5 % by weight. On germination, 

 the lengths of tlie plumule and the radicle were determined, 

 sketches of an average specimen having been taken each time. 



The result may be seen from the following tables and sketches 

 (Plates XVI-XVII). The first experiment was made in July 1895, 

 and in May 1896 the experiment was repeated. 



* Der allgem. landw irthschaftl. Pflanzenljau. Wien, 1879. 



