Part V.] 
THE PARK PINETUM. 
267 
have averaged a yard a year. The soil is clay 
on chalk (very unfavourable for pinuses), with a 
few barrows of road-sand mixed at the first 
planting. 
For the park I recommend the Deodara cedar, 
the Araucaria imbricata, the Taxodium sem- 
pervirens, and the Cryptomeria Japonica. 
I have never met with any observations on 
the length of time which the grasses , or leaves of 
cone-bearing trees, remain alive. Perhaps two 
whole years at the least; in many cases, much 
longer: and I should doubt if the Araucaria 
and Cryptomeria have any fixed natural period 
for shedding their leaves. The generality of 
English evergreens defoliate as regularly as 
other trees called deciduous: but evergreens 
retain their leaves about a whole year; deci¬ 
duous trees, about half a year. 
I conclude by recommending the practice of concluding re- 
J ' marks. 
transplanting with the ball of earth, without re¬ 
ference to the theories with which it has been 
supported. Indeed, with regard to them, I do 
not believe that in all vegetable physiology or 
agricultural chemistry there is one principle to 
be depended on. In fact, the last science is a 
new light to us, for the first glimmerings of 
