STi:UIE.S IN TUE EFFECT OF RÖNTGEN Il.\YS. ETC. 271 



In the seeds, whose wftter content wtis 50% (31 horaa' steeping), there 

 were ci-eftses on the seed coi\t, of course before tho in-acliation, iit the time 

 i)f sowiup;, 17 liniirs after the end of the hradiatiou, :m<\ the writer saw no 

 conspicuoiK i-]i:iii{j;os in 40H-sceds, as in the case of tlio seeds whose water 

 content was 57.5^ (4(5 hoiu-s stcepiup;) — refer to P. 270. 



A\ATOJ[ICAL OßSEUV.VTIOX OF THE Le.VF. 



Using the leaves of plants of Ex^ieriment III, tlie anatomical differoncos 

 of the jnesophyll of each gi'oup were observed, Ijiit there was no diifovenco 

 among these. But the attention of tlie writer was atti-acted by the fact tliat tlio 

 (quantity of uhlorophj-ll of the 80 H- and 120 Il-phiuts Wiis less tlian that of tlie 

 others, sj that the appearance of those plants on the whole was j'ellowish 

 compared with that of the couti'ol and the others. A 100 H-plaut died tefore 

 tlie observation. 



The object of ex^^eriments fi'om V to VII was to cultivate Vieia faha in 

 the normal season und to compare with the results already stn,ted which were 

 obtained draring the period extending fi'om April t(3 June tinder uusiütable 

 envu'onments for Vicia faha, and, on the other hand, the former expsrimeuts 

 Avere repeated. Moreover, there was no experiment as to the effect of tha 

 rays upon the air-dried seeds in the former experiments, so the writer made 

 it side by side. 



Seeds of "Hyogo" (1917-crop), a race of Vida faha, were obtained fi'om 

 the farm of the College of Agricidturo and used for these experiments. Un- 

 fortunately, the seeds wcrc few in niunljer, so the AVTiter could not miuimize 

 the indi\-idual deviation of the weight of seeds, as in the former cases, but 

 seeds -with an ak-dried weight of 0.97-1 .07 gi-. (average 1.02) were used for 

 Experhaents V and \1, and, in Exiierimeut VII, seeds of 1.28 gi-, (average) 

 were used. 



As to the in-adiation, all the precautions were the same as in the former 

 cases. 



