von Schrenk — Trees of St. Louis as Ivjiuenced by Tornado. 39 



full of sap. The tree bore a crown of green leaves until 

 the end of September. When this tree was cut down in 

 November, it was found that the whole trunk had become 

 almost dry, except a segment one inch in width on the north 

 side. 



As the trees were being cut down in November numerous 

 sections were taken from all parts of trunks and branches to 

 determine the nature and extent of the drying in both wood 

 and bark. The amount of such drying which was found was 

 very large. Of some iSfty or more maples the large number 

 when seen in section showed but one-quarter to one-half of 

 the woody cylinder in the normal condition. The drying 

 usually took place in the form of a wedge, which was narrow 

 at first, and gradually increased in width. (See PI. IX.). 

 Analyses were made to determine the exact amount of water 

 lost. These were made for the soft maple, box elder and 

 linden. The summed-up results are as follows: — 



