THE FORESTRY EXHIBITION AT DERBY. Or 
17. The Forestry Exhibition at the Royal Show, 
Derby, 1906, and some of its Lessons. 
By a CORRESPONDENT. 
The Forestry Exhibition at the “Royal” was this year 
organised by the Council of the Royal English Arboricultural 
Society, under the personal supervision of Mr George Marshall. 
The greater portion of the forestry exhibits was housed within 
a shed erected for the purpose, and associated with agricultural 
education, nature study, and school gardening; and the 
combination of these kindred exhibits was so full of instruction, 
both of a practical and scientific kind, that it would perhaps 
be difficult to say whether the direct knowledge gained from the 
forestry exhibit, or the indirect knowledge gained from the 
associated exhibits, was the more valuable. In the case of 
forestry, perhaps the indirect knowledge and indirect returns are 
more valuable than the direct. Judged from this standpoint, 
therefore, the Royal Agricultural Society acted wisely in com- 
bining agricultural education, nature study, and forestry in one 
united section. 
As regards some of the more important exhibits connected 
with agricultural education, the Rothamstead Experimental 
Station had examples showing the effects of nitrogenous manures 
on various crops, under varying conditions, resulting from ex- 
periments lasting over many years, and illustrated by diagrams. 
The Royal Agricultural College, Cirencester, arranged 
their exhibits under three heads, viz., Agricultural Chemistry, 
Geology, and Biology. Perhaps the last appealed most directly 
to the forester, inasmuch as it contained very good illustrations 
and examples of plant diseases, insects injurious to crops, ticks, 
lice, etc. As regards ticks, it may be noted that the study of 
these is now considered very important by the colleges, as they 
are very potent agents in spreading disease amongst animals, 
The South-Eastern Agricultural College, Wye, showed some 
very good examples of living insects feeding on their respective 
host-plants. These were arranged by Mr F. V. Theobald, 
who has devoted considerable attention to, and has done 
some very important work in, this section of biology. 
Cambridge University exhibits were under the supervision of 
