EXPERIMENTS ON VEGETATION IN SOLUTIONS. 



359 



of the weights of the crops. (Continued.) 



REMARKS ON THE SUMMARY OF THE WEIGHTS OF THE CROPS. 



I. Plants A, B, c, and D grew in normal solutions. Plants A and 

 B were placed in the solution on July 1, and plant A was gathered 

 on September 10, fully ripened ; its total height was 202 centi- 

 metres. The plant from the garden soil with which it was com- 

 pdred was of middle size. Plant B gathered on September 27, 

 was fully grown, and had a height of 127" centimetres. Plants c 

 and D were placed in the normal solution on June 10, they did 

 not attain their full growth ; both were gathered on October 28. 



II. Commencement of experiment in solutions without ammonia 

 on June 10. A and B received on July 12 a supply of 0-2 gramme 

 nitrate of ammonia ; on July 23 they were placed in a fresh solution, 

 to which was added 0*2 gramme acetate of ammonia ; both plants 

 died on July 31. Plants c and D received normal solution on 

 August 4, which was neutralised with phosphoric acid; o died on 

 August 9, D recovered somewhat, but remained sickly till gathered 

 on September 27. 



III. Experiments without nitric acid. Commencement on 

 June 10 ; rapid decay of the plants ; by July 1 A and B were al- 

 ready dead. 



IV. Experiments without nitrogen. Commencement on June 

 10. In the first week the growth was excellent, but in the second 



