28 PHILOSOPHICAL SOCIETY OF WASHINGTON. 
ification 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, Fiercuer, 
Marcus Baker, GILBERT, and the author. 
Mr. Lester F. WarpD 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 U.S. 
Geological Survey, 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 WiLL1AM Henry Bascocx. 
Mr. C. E. Durron presented a communication which had been 
jointly prepared by himself and Mr. 8. Newcoms 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 Wm. W. 
Payne. 8°. Northfield, Minn., Carleton College observatory, 1887, Decem- 
ber, vol. 6, No. 10, pp. 829-349. ] 
