536 Geological Society :— 
hull, such as the rudder, funnel, fastenings of deck houses, &c., is of 
a magnetic character differing from the hull of the ship, proximity to 
any such should be avoided, and, as far as possible, the compass 
should be so placed that they may act as correctors of the general 
magnetism of the hull. ! 
As most compasses are affected by the magnetism of the ship to 
an amount depending on their elevation, and the direction of the ship 
in building, the disturbances will be large comparatively, except in 
those vessels built head east or west. 
A series of Tables is appended, wherein the magnetic coefficients 
and ship’s force and direction of the various classes of vessels are 
given, the ships being classed according to the nature of their mate- 
rial and machinery. 
GEOLOGICAL SOCIETY. 
[Continued from p. 311.] 
March 20, 1861.—L. Horner, Esq., President, in the Chair. 
The following communications were read :— 
1. “On a Collection of Fossil Plants from the Nagpur Territory, 
Central India.”” By Sir C. Bunbury, Bart., F.R.S., F.G.S. &c. 
The specimens examined by the author were collected by the Rev. 
Messrs. 8. Hislop and R. Hunter, and presented to the Geological 
Society in 1854 and since. The vegetable remains described in 
this paper are :—1. Glossopteris Browniana, var. Australasica, Ad. 
Brongn. G. Browniana, var. Indica, Ad. Brongn. By much the most 
abundant plant in the collection. 2. G. musefolia, sp.nov. 3. G. 
leptoneura. 4. G. stricta, sp. un. 5. Pecopteris, sp. 6. Cladophle- 
bis (?). 7. Teniopteris daneoides, M‘Celland (?). 8 and 9. Fili- 
cites: possibly Glossopteris. 10. Neggerathia(?). 11. Phyllotheca 
Indica, sp.n. 12. Vertebraria(?). Different from the true Verte- 
braria, and probably roots. 13. Knorria(?). 14. Stigmaria (?). 
15. Part of a stem, somewhat Sigillarian in appearance. 16. Yuc- 
cites (?). The fruits and seeds are reserved for further examination. 
On a general survey of all these plant-remains, the author for the 
present considers the facies of the fossil flora under notice to be 
Mesozoic rather than Paleozoic, but he regards the question as an 
open one, and requiring much further light for its perfect elucida- 
tion. 
2. ** On the Age of the Fossiliferous thin-bedded Sandstones and 
Coal-beds of the Province of Nagpur, Central India.” By the Rey. 
Stephen Hislop. Communicated by the President. 
The author first pointed out the places near the city of Nagpur 
where the plant-bearing sandstone has been best studied. He next 
noticed the carbonaceous shales underlying thick sandstones, at the 
foot of the Mahadewa Hills and the coal-seams of Barkoi, near Umret, 
80 miles and more N.W. of Nagpur; and pointed out their relation- 
ehip to the plant-bearing sandstone near Nagpur, as shown by the 
Glossopteris and other fossils found in each locality. 
