294 



PROCRRDIN(;s OK TIIF. 



prowinp: in tliosc circumstandivs for lliroe montlis, it did not 

 iijipoar tliat tlu' Kyaiii/cd \\knn\ had prodiicod any bad oiVocts. 



It ajipfarod thus tliat \vt)od ihppod in Kyan's tanks prochices no 

 injurious fiVocts upon phujts in a dry iind cool atmosphere; but 

 it rt inaiiUHl to be ascertained whether it would be ecjually harndess 

 in a warm and moist one. Some plants capable of standing a very 

 hi^h temperature were jnit under a hand-glass in the stove, and 

 several ])ieces of Kyani/ed wood were introduced amongst them. 

 In about tliree weeks, the plants began to look sickly, those leaves 

 which accidentally came in contact with the wood betrame yellow 

 and withered, and a line vigorous spec imen of the sensitive j)lant 

 was killed. The wood was then taken out, the i)lants top- 

 dressed and the hand-glass washed. The apparatus was put 

 back in the same place, the wood excepted, when the sickly 

 plants gradually recovered, their new leaves were fresh and green, 

 and were not injured as they had been before. 



On the 1st of April, seven hand ghisses with moveable tops 

 were placed side by side in the pit of a moist stove. Seven 

 Balsams of the same size, and ecpially healthy, were placed below 

 them, one in each. A small pan was then put under each glass 

 to receive the following substances. 



No. 1. Half an ounce of mercury. 



2. IJalf an ounce of corrosive sublimate, mixed with wet 

 saw dust. 



3. Was left in its natural state. 



4. Weak muriatic acid. 



5. Half an ounce of dry calomel. 



6. Half an ounce of dry corrosive sublimate. 



7. Moistened shavings of Kyanized wood. 



The plant in No, 1, where the mercury was, became visibly 

 affected on the 5th day, and in two days afterwards some weeds 

 which vegetated in the soil also looked sickly ; the plant gradually 

 became worse up to the 15th, when it had lost all its leaves and 

 was removed from under this hand-glass, and placed under No. 

 4, which contained the weak muriatic acid. This change of 

 circumstances had a marked effect upon the sickly plant, which 

 now began gradually to recover, and on the 30th of May — 

 about six weeks after its removal — it was perfectly healthy. 



At the time that the last plant was removed from No. 1, 

 namely, on the 15th of April, another healthy one was intro- 

 duced, which suffered in the same manner, and lost all its leaves 

 in nearly the same space of time. 



In No. 2, where the corrosive sublimate and moistened saw- 

 dust were, no bad effects were visible until the 12th day j but at 

 that time the leaves began to curl and look unhealthy, turning 

 yellow and finally dropping off, so that on the 15th of May it 



