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MISSOURI BOTANICAL GARDEN. 



just then opening were likewise killed, especially those near 

 the outer ends of young branches. By the middle of June, 

 the sycamore trees, which at this time of the year are usually 

 well covered with leaves, appeared as bare as they do in 

 February. The injury to sycamores noted about St. Louis 

 occurred universally to a considerable distance south of 

 St. Louis and as far east as the Atlantic seaboard, extending 

 through Illinois, Indiana, Ohio, Pennsylvania, New Jersey 

 and New York. For a month or more after the frost injury, 

 there were no signs of development, and a cursory examina- 

 tion of the trees gave the impression that the trees had been 

 killed outright. Small clumps of undeveloped leaves re- 

 mained attached to the smaller branches and the trees had all 

 appearances of having been severely frozen. By the end of 

 June, many buds which had not been killed, started to de- 

 velop. In most instances, these buds were confined to the 

 lower ends of the branches; in other words, they consisted 

 either of first or second buds, counting from the point of 

 origin of the branch. (See plate 7, lowest branch to the left). 

 These buds developed in the usual course into branches. 

 The frost had evidently killed all of the outer buds and by 

 the end of August, a large percentage of the sycamore trees 

 showed long dead branches mixed in with the foliage which 

 had developed since the end of June. 



In numerous instances, all of the buds on the one year old 

 branches had been killed. In such cases, one or more adven- 

 titious buds developed at the base of the branch, usually 

 one on each side of its insertion (see plate 7, right side of 

 figure). These buds developed with extraordinary rapidity, 

 and by the end of August, the branches developed therefrom 

 had the length commonly attained by branches developed 

 from buds which had opened in a normal manner at the be- 

 ginning of May. The conditions of several branches as they 

 were found toward the end of August in northern New Jersey 

 are illustrated on plate 7. 



Sycamore trees by the end of August appeared as if they 

 had less than half of the leaves usually found on the branches. 

 The entire crown is filled with long, dead twigs around the 

 base of which bushy masses of leaves have developed. The 



