ANNUAL GROWTH OF TREES. 



205 



of them out. While cutting, I 

 noticed that the concentric rings 

 were very distinct, and it re- 

 minded me of M. Charnay's 

 statement. I took sections from 

 the butt-end of each tree (four 

 of them) and dressed the ends 

 off, at an angle of some 35 

 with the line of the body, thus 

 largely increasing the exposure 

 of each ring, and then counted 

 them. 



The situation, exposure, and 

 condition of these four trees 

 were, so far as I could see, iden- 

 tical. I had personal and posi- 

 tive knowledge that they had 

 each twelve years' growth upon 

 them, and I could count on each 

 of the different sections from 

 thirty-five to forty concentric 

 rings. True, I could select 

 twelve more distinct ones be- 

 tween which fainter and nar- 

 rower, or sub-rings, appeared. 

 Nine of these apparently annual 

 rings on one section were pe- 

 culiarly distinct, much more so 

 than any of the sub-rings ; yet, 

 of the remaining, it was diffi- 

 cult to decide which were an- 

 nual and which were not. 



The thickness of these an- 

 nual rings varied from two and 

 one half millimetres to twenty- 

 eight. This measure, of course, 

 gave more than double the real 

 thickness ; but was preferable 

 to a right-angled measure, as it 

 gave better facilities for exact- 

 ness, and yet preserved the pro- 

 portion between the several 

 rings unchanged. 



Now, to ascertain what rela- 

 tion or connection there might 

 be between the meteorology of 



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