Hi 

 May /^th, 1891. 



Professor Nipher in the chair ; four members present. 



Prof. Nipher read a paper on the determination of the max- 

 imum output and efficiency of an electric motor, in terms of the 

 current which will flow through the motor when running with- 

 out load, and the current when the motor is at rest, the terminal 

 potential being held constant. 



May iSth, 1891. 



President Nipher in the chair; eight members present. 



Dr. Wellington Adams presented a "Discussion of the Problem 

 of Mechanically Propelling Road Vehicles," calling attention to 

 the work in this direction in the past, the essential qualifications 

 for success, concluding with an illustration and description of 

 what he considered a practical solution of the problem. 



June isi, 1891. 



President Nipher in the chair ; fourteen members present. 



Prof. Pritchett read a paper on "Observations of the Transit 

 of Mercury," together with an account of the observations made 

 by Mr. O. B. Wheeler. Referred to the Council for publi- 

 cation. 



Dr. Hinrichs exhibited a large scale drawing of the recent de- 

 terminations of G. C. Schmidt [Ztsch. Physikal. Chemie, iSyi, 

 pp. 433-467] of the boiling points of six fatty acids under pres- 

 sure up to one atmosphere. 



On motion, the President appointed a committee, consisting 

 of Messrs. Pritchett, Moore, and Leete, to draw up a suitable 

 memorial of the late Judge Samuel M. Breckinridge to be sub- 

 mitted to the Council, and, if approved by them, a copy to be 

 sent to the family of Judge Breckinridge, and to be reported to 

 the Academy in the fall. 



Adjourned until the third Monday in October. 



