T. FUKUTA. 



2. Wheat. Young wheat plants of 15 cm. length kept in 

 the same solutions were first injured by quinone, then followed 

 hydroquinone and the other compounds in the same order as 

 observed with the soy shoots. A second experiment with 0.5 

 per mille solutions yielded essentially the same results. 



Experiments with Twigs. 



Twigs of plum trees of about 20 cm. length and bearing 

 20 — 22 flower buds were placed in the same solutions. In 

 quinone the buds withered and gradually dropped off ; not one 

 had opened. In hydroquinone, only four buds opened within 

 twenty-one days ; the others had withered. In resorcin, two 

 buds opened within eleven days ; later on all the buds developed 

 into flowers. In pyrogallol seventeen buds opened within 

 twenty-one days. A second test with bud bearing peach twigs 

 15 cm. long yielded similar results. — Vapours of quinone seem 

 to be much more poisonous than the aqueous solution. 



A young cabbage branch placed in a flask covered with 

 a glass plate, was exposed to the vapours which one gram of 

 quinone developed from the bottom of the vessel at the ordinary 

 temperature. This branch died within twenty-two hours ; the 

 turgor was lost and the normal color was changed. Young 

 leaves of Trifolium, Photinia, and Rhododendron died under 

 these conditions within twenty-five hours. Leaves with a thick 

 cuticle, as those of Camellia, succumbed more slowly. Isolated 

 leaves placed on a 1 per mille solution of quinone died within 

 two days ; while it took 4 — 5 days with hydroquinone, and ten 

 days with resorcin and pyrogallol. 



Experiments with radish seeds left no doubt, that the 

 germinating power was greatly injured by three days soaking 

 in a 1 per mille quinone solution. Of 50 seeds only 8 germi- 

 nated, as compared with 25 in the control case. 



Experiments with Algae. 



Diatoms and filaments of ftlesocarpus and Spirogyra were 

 placed in 1 per mille solutions of quinone, and observed every 

 thirty minutes under the microscope to ascertain whether the 

 protoplasm was contracted and the contents of the cells would 



