RECORDS OF MEETINGS. 713 



May I add that it is a peculiar gratification to myself, and will cer- 

 tainly be to some others present, that we have a personal acquaint- 

 ance with at least two of the instruments which were used on this 

 adventure. 



In the collections of the Department of Physics at Cambridge is the 

 two-foot reflector used by Professor Williams ; on it is a silver plate 

 bearing the arms of Pepperell and Sparhawk, — both good examples of 

 canting heraldry. It was the gift of Sir William Pepperell after the 

 destruction of the collection of Philosophical Instruments in Harvard 

 Hall in 1764. 



It is furnished with a divided object glass micrometer by Dollond, 

 the precursor of the modern heliometer. A similar micrometer, the one 

 with which Professor Williams made his measurements, was attached 

 to the smaller reflector of one foot focus. This little instrument now 

 has a place in the Faculty Room at Cambridge, just under the portrait 

 of John Winthrop, in which it is faithfully depicted as an artistic 

 accessory. 



Gentlemen, it is almost no exaggeration to say that to-day, at our 

 thousandth meeting, we have a thousandfold advantage over the found- 

 ers. In the interval — back of us, before them — lies the century won- 

 derful of science. But theirs were no small beginnings. I congratulate 

 the Academy on its first research. 



The last toast proposed was " The Millenium," responded to 

 by Professor George L. Kittredge. 



The celebration closed with thanks to Dr. Louis Bell and to 

 Professor W. M. Davis for their inception of the quaint celebra- 

 tion of the one thousandth meeting, and for their success in 

 making it a memorable one. 



The following papers were presented by title : — 



" On the Internal Resistance of the Lead Accumulation." 

 By H. W. Morse and L. W. Sargent. Presented by John 

 Trowbridge. 



" The Wave Potential of a Circular Line of Sources." By 

 A. G. Webster. 



" Division of Labor among Ants." By Edith N. Buckingham. 

 Presented by E. L. Mark. 



" A New Method for the Study of Elastic Hysteresis." By 

 A. G. Webster and T. L. Porter. 



" The Action of Metals on Ketoric Chlorides of the Aromatic 

 Series." By J. F. Norris. 



