Record. xxxiii 



Professor F. E. Nipher discussed his recent work on 

 the effect of a sudden drainage of negative corpuscles 

 from matter. 



Maech 18, 1912. 



President Engler in the chair; attendance 32. 

 The following donations to the Museum were re- 

 ported : 



J. A. Drushell. . . 5 species of Ordovician Brachiopods, 



2 species of Ordovician Bryozoa. 

 Mary J. Klem..A section of a fossil tree trunk from Veedersburg, 



Indiana. 



The following report of the committee, appointed by 

 the President to write a memorial to the late Dr. Enno 

 Sander, was read and ordered spread on the records of 

 the Academy. 



The Academy of Science of St. Louis wishes to place upon record 

 Its great appreciation of the valuable service which has been rendered 

 to it by Dr. Enno Sander. 



He became a member during the first year of its history, fifty-five 

 years ago. For nearly fifty years he served as its Treasurer. Much 

 of its success is due to the attention which he gave to its financial 

 affairs. In his death the Academy loses a valued supporter. 



(Signed) FRANCIS E. NIPHER, 

 WM. TRELEASE, 

 ADOLF ALT. 



Dr. Eobert J. Terry spoke on "A Grove of Deformed 



Trees." 



A grove of four or five hundred small persimmon trees in St. 

 Louis County has suffered from the ravages of a beetle which has 

 been identified as Oncideres cingulata. Limbs varying in diameter 

 from 5 to 15 mm. are girdled and the ends fall to the ground. All 

 the trees, old and young, have been attacked. The girdling is done 

 in the fall, mainly in September and October. During this time the 

 larger trees present scores of branches bearing dead leaves and the 

 ground is strewn with fallen branches often laden with fruit. Small 

 trees have, in some instances, lost several or all of their main limbs 

 in one season, in others been divided so near the ground that only 

 a short stump of the tree remains. The work is indeed a most com- 

 plete pruning; but the operation evidently does not consider the 

 future symmetry of the persimmon tree. Buds on the truncated limbs 

 develop an excess of branches the following spring, some of which in 

 turn are cut away at some future time. The highest latent buds of the 



