Agriciilti/ral Education Exhibition, Sh>'eirs/nir>/, 1914. 173 



models of closely and loosely })acked manure heaps, and 

 diagrams showing the extent of the loss of nitrogen, were 

 exhibited. It was shown that a high temperature in the heap 

 is not necessarily accompanied by a loss of nitrogen. Farmers 

 are advised to pack farmyard manure as closely as possible, and 

 to avoid pumping liquid manure over the heap. 



A new and very simple method for the determination of 

 the amount of chalk in a soil was shown. Another method 

 demonstrated how the requirements of a soil for quicklime or 

 chalk might be obtained. This latter is more important, and 

 has given very striking results, which have been confirmed by 

 chemical and biological analyses of the soil, as well as by the 

 growth of different crops in soils which have received various 

 quantities of chalk or quicklime. Pots containing turf illustra- 

 ted the resistance of various plants to acid conditions of the soil. 



Specimens were exhibited to illustrate the various methods 

 whereby weeds reproduce themselves, and the weeds of the 

 hedgerow were compared with those of arable land. 



The beneficial effects of partial sterilisation of, or addition 

 of various chemical antiseptics to, sick greenhouse soils on the 

 growth of tomatoes, chrysanthemums, and vines, was well 

 illustrated. 



There were also small stacks and ricks which demonstrated 

 the effect of manures on the quality and quantity of produce 

 from the permanent experimental grass and arable land at 

 Rothamsted. 



Photographs of Lawes and Gilbert, of the first laboratory 

 (1843-1855), the testimonial laboratory erected in 1855, and of 

 the proposed new laboratory to celebrate the centenary of 

 Lawes and Gilbert this year, illustrated the great development 

 which has taken place at Rothamsted during the last sixty 

 years. 



Harper-Adams Agricultural College. — This exhibit filled 

 about one-half of the exhibition tent. The colour scheme was 

 attractive, and the removal of the partitions of the bays added 

 greatly to the comfort of visitors and enabled the staging to be 

 done more tastefully. The idea of dividing the exhibit into 

 special subjects, and placing the College expert of that subject 

 in charge, enabled visitors interested in any particular point 

 to get immediate information. 



Biology. — A set of mounted specimens, with full descrip- 

 tions of their life-history, of the chief pests to which our farm 

 crops are subject was instructive. Bell-jars containing in the 

 one case turnip-fleas and in the other clover-weevil on their 

 respective crops, and mounted specimens of cereals showing 

 insect pests in all stages of their life-history were familiar to 



