10 Wisconsin Academy of Sciences, Arts, and Letters. 
Vochting 23 also found that decapitating herbaceous plants re¬ 
sulted in the cessation of radial growth of the stele though in¬ 
crease in diameter may result from the growth of the pith and 
cortical parenchyma. After such decapitated plants were 
budded cambial activity was resumed. 
Reiche 24 also notes regarding trees of Chili that radial growth 
begins after the buds burst and that it does not occur unless bud 
development precedes it. 
The more detailed experiments by Lutz 25 also give support 
to Jost ’s conclusions regarding the relation of growing leaves or 
buds to radial growth, and they show besides that other things 
being equal the distribution of food may also be a determining 
factor in the occurrence of radial growth. All the buds and 
leaves of six to ten-year old trees of Fagus silvatica and some of 
Finns silvestris five to seventeen years of age were removed at 
intervals from spring through the summer and the amounts of 
reserve starch and growth were determined. The buds were re¬ 
moved on March 20 from a Fagus which was about a meter high. 
Branches were examined for the distribution of starch and for 
radial growth on June 15, July 1, 15 and 30, August 10 and 20, 
on the 10th of September, October and November, as well as De¬ 
cember 5 and 23. The adventitious buds were removed but con¬ 
tinued to reappear, some large ones being removed on October 
10. Only minor fluctuations in the starch content of the pith 
rays, wood and bark of the branches were noted through the sum¬ 
mer with an almost entire disappearance of starch in December. 
The branches remained healthy-looking but no radial growth re¬ 
sulted. Similar trees were defoliated on May 20, June 15, 
July 1, 15 and 30, and August 28 respectively, and also freed of 
buds at intervals during the remainder of the growing season. 
Branches of these trees were also examined on the above dates. 
In the tree defoliated on May 20 no starch was found in the 
branches aside from traces which occurred in the pith and 
broad rays during midsummer, and even that had disappeared 
by August 20. Only a small amount of radial growth took place 
which had all occurred by July. On October 30 the stem or 
trunk was found to contain considerable starch at the ground or 
24 Reiche, K. Zur Kentniss der Lebensthatigkeit einiger chilenischen 
Holzgewachse. Jahrb. Wiss. Bot. 30:81-115. 1897. 
85 Lutz, K. G. Beitrage zur Physiologie der Holzgewachse. Beit- 
rage Wiss. Bot. 1:1-8. 1897. 
