28 
PHILOSOPHICAL SOCIETY OF WASHINGTON. 
ificatioD of observations, preparation of subject index and periodical 
list. The technical preparation of copy will follow when’ the appro¬ 
priation for publication is made. 
This communication was discussed by Messrs. Mann, Fletcher, 
Marcus Baker, Gilbert, and the author. 
Mr. Lester F. Ward made a communication 
ON THE GEOGRAPHICAL DISTRIBUTION OF FOSSIL PLANTS, 
illustrated by a map. 
[This paper will appear in full in the Eighth Annual Report of the IT. S. 
Geological yurve 3 ^ for the fiscal year 1886-’87.] 
307th Meeting. November 12, 1887. 
The President in the Chair. 
Fifty-two members and guests present. 
Announcement was made by the President of the election to and 
acceptance of membership of William Henry Babcock. 
Mr. C. E. Dutton presented a communication which had been 
jointly prepared by himself and Mr. S. Newcomb on 
THE SPEED OF PROPAGATION OF THE CHARLESTON EARTHQUAKE. 
[This paper appeared in full in The American Journal of Science, 3d 
series, 8°, New Haven, 1888, January, vol. 35, pp. 1-15.] 
This paper was briefly discussed by Mr. Clark and Mr. Dutton. 
Mr. Harkness read a paper 
ON THE REPRESENTATION OF COMET ORBITS BY MODELS, 
illustrated by card-board models. 
[This paper appeared in The Sidereal Messenger; conducted by Wra. W. 
Pajme. 8°. Northfield, Minn., Carleton Collegeobservatoiy, 1887, Decem¬ 
ber, vol. 6, No. 10, pp. 329-349.] 
