76 CHRISTISON—OBSERVATIONS ON 
The Hungary Oaks only came under observation in the same 
year as their Turkish cousins, but, like them, a rise from 3°60 in 
1880 to 5°15 in 1881 indicates a marked depression during the 
severe winters of 1879 and 1880. They then went on steadily 
till 1888, a year of pretty general depression, when they 
descended nearly to the level of 1880. Another severe fall, 
to 4°05, occurred in the generally unfavourable year of 1891, 
but an immediate recovery took place, and in 1893 they 
reached their maximum of 600. A severe pruning, to promote 
upward growth, has been successful in that object, but has 
reduced their girth-increase to a mere trifle for six years. 
Previously it is plain that, on the whole, their girth-increase 
had been increasing, due probably to their being adolescents 
and not adults, 
The range in the first decade was from 3°60 to 5°40, and in . 
the second from 3°65 to 6°00. 
[ AGGREGATE, 
