Academy with a copy of the ''Botanical Works" of the late Dr. 

 Engelmann. 



On motion of Prof. Prit. hett, a vote was passed expressing to 

 Mr. Shaw the thanks of the Academy for the gift; for the aid 

 which the publication of this work, due solely to his munificence, 

 renders to the cause of sciLnce, and for the great service he had 

 rendered to the Academy I y placing in permanent form and mak- 

 ing everywhere accessible to scientific men the works of Dr. 

 Engelmann, for many years our honored President. 



The Secretary was instructed to inform Mr. Shaw of the actiori 

 of the Academy in a suitable letter. 



Prof. Trelease preserited a description accompanied by a num- 

 ber of specimens of an undescribed Puff-ball which he had 

 discovered in this region. Referred to the Committee on Pub- 

 lication. 



Mr. Wm. McAdams exhibited and read a description of a fos- 

 sil tooth found in the St. Louis limestone near Alton, 111., and 

 supposed by him to have belonged to a very old Saurian. The 

 paper was referred to the Committee on Publication. He also 

 exhibited several specimens of Geniatites. 



Mr. M. L. Gray announced that the Supreme Court had af- 

 firmed the decision of the lower court, by which the property left 

 by Mr. Lucas to the Missouri Historical Society and the Academy 

 of Science jointly was to be equally divided between these two 

 associations according to the conditions of the will. 



The President called attention to the value of Mr. Gray's 

 service in looking after this matter, and expressed to him for the 

 Academy its appreciation of his kindly offices. 



April 2d, i< 



President Nipher in the chair ; thirteen members present. 

 Mr. Seddon presented the equation for the equivalent in hy- 

 draulic flow of the tangential force acting on a solid sliding down 

 an inclined plane : 

 The equation was 



R = ttAH. 

 in which R = total tangential force in a given length. 



7t =■ density of fluid. 

 A =z arm of cross-section. 

 H HZ fall in the given length. 



