Agricultural Education Exhibition , Bristol , 1913. 283 
arsenic in amounts varying between 0 to 2,000 parts in ten 
million of solution were used. Manganese sulphate in the 
larger amounts appears to be poisonous, but in the lower pro- 
portions beneficial. Zinc sulphate and copper sulphate do not 
appear to have any beneficial result even when used in the 
smallest quantities. There was also a nice collection of weed 
plants in specimen glasses showing the root growth of each. 
Another striking feature of this exhibit was a set of miniature 
hay stacks representing the proportion of true grasses, legumin- 
ous plants and weed growths that have been produced on the 
well-known grass plots that form such a distinctive feature of 
the Rothamsted Station. The two stacks showing the absence 
of leguminous growth as well as the excessive coarseness of the 
grasses from the use of ammonium salts were specially note- 
worthy, and well impressed the lesson they were intended to 
teach. The question of the partial sterilisation of “ sick ” soil 
by heating and by the application of different chemicals was 
shown by tomato plants growing under different conditions of 
treatment in large pots of soil, and the effects on the foliage 
were most noticeable. 
There were some remarkable specimens of barley growing 
in large earthenware pots, illustrating the effect of lime and 
chalk on the ammonia and nitric acid in different types of soil, 
and results Avere further exemplified by a series of diagrams 
explaining how the amount of both ammonia and nitric acid 
had varied with the amounts of the applications. T, ‘2, *3, *4, 
and 1 per cent, had been added to the soil before planting the 
seed, and it was apparent how detrimental had been the action 
of 1 per cent, caustic lime on the barley plants’ groAvth ; half 
this amount, ‘5 per cent., was quite of a beneficial character, 
and Avhen 1 per cent, of ground chalk was made to take the 
place of 1 per cent, caustic lime, the resulting plants were 
decidedly better than the control pot where neither lime or 
chalk had been used. The exhibit further showed that very 
considerable differences occur with different types of soil, but 
there did not appear to be any regulating factor determining 
why such differences should be. This exhibit gave much 
matter for thought and consideration, and we would venture to 
suggest that it would be of the utmost A^alue to visitors if the 
Station could arrange another year to have some one in charge 
during the whole time of the Show. 
South Eastern Agricultural College, Wye, Kent. — This 
exhibit included a very attractive display illustrative of apple- 
boxing. The College has done much pioneer work in this 
direction wirh very satisfactory results, and careful grading 
and packing are beginning to revolutionise the English apple 
trade. Some boxes Avere shown of fruit packed in paper, and 
