874 REPORT— 1897. 



Another set of seedlings was then exposed for two days outside of the dark 

 room. There was no perceptible influence. 



The absorption of the Rontgen rays by the plants was then studied. RiJutgen 

 photographs of the seedlings experimented with, as well as of the internal structure 

 ■oi AriscBmatriphyllum, Pellandra virgmica, fruits of Cycas, Fodophyllum peltatum, 

 pea, bean, peach, plum, cherries, &c., and of the venation of leaves and internal 

 parts of flowers were readily obtained ; which shows that, while the rays penetrate 

 plant tissues, they are also readily absorbed by the same. The lack of injuries or 

 other influences then cannot be ascribed to non-absoi-ption of the Rontgen rays. 



Experiments were also made upon three species of Mucor, on several species of 

 Bacteria, and on one species of Oscillatoria. No influence was exerted on the 

 •growth or movement of any of the plants experimented with. 



