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Any Growth Left: Lateral growth in trees frequently begins later than growth in height, but the period of lateral growth is longer. Rates of lateral growth likewise are low at the outset, increasing after a few weeks and then diminishing. In view of the long annual period of lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In the wood of trees of temperate regions, narrow and wide growth rings may be observed, marking years characterized by unfavorable and favorable conditions for growth.
The growth in Chicago's population from the ,ivi War until World War II was staggering, 'his growth has left its mark on the present haracter of Chicago, since much of it resulted rom immigration, and many growth left of the immigrants ettled in racial or ethnic groups. The first large thnic group to reach Chicago was the Germans, fhey were followed by the Irish, Italians, Mexi-ans, Puerto Ricans, Scandinavians, eastern Euro-icans, and, more recently, Southern Negroes.
!. Urban Development
His discovery of the technique of Tissue culture in 1907, made with nerve cells from which he had observed the growth of nerve fibers, provided his direct experimental evidence. Characteristically, he left the development of Tissue culture technique to others and devoted his efforts to pure research. He made fundamental transplant studies of polarity and asymmetry in embryonic organs and of the control of organ growth.
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