82 
where the growth is great in the upper curve, which is 
the Main curve, it is great in the two following ones 
which are the Moselle-curve and what we might perhaps 
call de Rhine-curve. Where the growth is small in the 
upper one it is generally small in the others. There are 
exceptions, but then the metereological influences: tempe- 
rature and especially rain are not the same for different 
regions. They have much in common but still are not 
at all the same. The point is that the parallelism is so 
great that on an average, if at the Main the growth is 
double the mean growth, it is more than 50 ‘/, above the 
mean at the Moselle, at a distance of 140 miles. Now this 
could never be if the fluctuation were due to local influences. 
IL The temperature has, generally speaking, a very 
small influence in these regions. 
Proof. Although we have no long series of tempera- 
ture records for our regions, we have lists of 
Hot summers 
Cool 
Cold winters 
Mild , 
Now for all the hot summers Î got out the average 
growth; likewise for the cool summers. There is hardly 
a difference. 
In the same way the growth in the growth-season after 
very cold winters proves to differ but little from that 
after mild winters !). 
III. For part of our materials at least, the rain, fal- 
ling in spring and summer is of the greatest influence. 
The fact can be proved only for part of our materials, 
because we have no extensive data about the rain near 
the greater part of our forests. But for the city of Treves 
we have respectable data and comparisons with the trees 
1) See note I. 
