heres a link that might be usefull
http://www.aie.org.uk/aie_data/aie_firewood.html
and an old rhyme
Oaken logs, if dry and old,
Keep away the winter's cold
Poplar gives a bitter smoke,
Fills your eyes, and makes you choke
Elm wood burns like churchyard mould,
E'en the very flames are cold
Hawthorn bakes the sweetest bread -
Or so it is in Ireland said,
Applewood will scent the room,
Pearwood smells like flowers in bloom,
But Ashwood wet and Ashwood dry,
A King can warm his slippers by.
Beechwood logs burn bright and clear,
If the wood is kept a year
Store your Beech for Christmas-tide,
With new-cut holly laid aside
Chestnut's only good, they say
If for years it's stored away
Birch and Fir wood burn too fast,
Blaze too bright, and do not last
Flames from larch will shoot up high,
And dangerously the sparks will fly....
But Ashwood green,
And Ashwood brown
Are fit for Queen with golden crown.