14 Wisconsin Al<my of Sciences, Arts, and Letters. 



A tree with S2 rings at its base and 22 in. high was cut in 

 Mjnvli. Tin- hark was fairly rich in starch from the ground up. 

 Tin- :5- outrr Hugs of wood contained starch. At the first 

 I, randies .12 in. above ground, where the stem had thirty rings, 

 only the Bfteen outer rings were alive and starch bearing. At a 

 height of 18 m. eleven or twelve of the fourteen rings present 

 contained starch. Considerable starch occurred in the wood at 

 the tree's hasc and decreased rapidly upward to a minimum 

 about 3 m. above ground, above which it gradually increased 

 again to a maximum just below the branches. From this point 

 upu-ard a decrease occurred which reached a second minimum 

 18 m. above ground, and was followed by a second increase up- 

 ward to a maximum at the point where the stem had but six 

 wood rings. No fats could be found in the bark and very little 

 in the wood. Apparently fats had been changed to starch. 

 More starch was present in the small branches of this tree than 

 of the one cut in February. Both the wood and bark of the 

 roots contained considerable starch except the youngest phloem 

 cells which were devoid of it. In excentric roots the starch dis- 

 tribution was similar to that found in the former tree. 



Another tree which was much like the one cut in March as to 

 size, age, etc., was cut in late April. Its bark was rich in starch 

 with the exception of the phloem about 8 m. above ground where 

 none occurred. The reduction in the number of live, starch- 

 bearing wood rings from below upward was about the same as 

 in the other cases. The wood rays near the cambium were de- 

 void of starch. A slight amount of fat was present in the bark, 

 while that of the wood increased from a small amount at the 

 base of the tree upward to a maximum in the smallest twigs 

 where it exceeded the starch. In this case a starch maximum 

 occurred also at the base of the trunk, while in the branch bear- 

 ing part of the stem the starch was evidently being dissolved 

 from the cambium inward and in increasing extent upward. 

 Fats were abundant throughout the trunks and also present in 

 the wood of the larger roots but absent from the bark of roots. 

 But very little starch was present in the wood-rays at the base 

 of the trunk and the season's growth of wood was devoid of 

 starch, while the previous year's growth was almost free of it in 

 mid-June. From this region upward starch-free peripheral 

 wood increased up to the first branches, where it included the 



