73 



accurate knowledge of this most important element of our 



position. Thus : 



Estimated Weight. 

 M. S. 

 By moon-culminating Stars, 1=4 13 01 



Eclipse, 1835 2=8 28 10 



Triangulution 1=4 19 50 



Eclipse, 1847 1=4 18 95 



5)21 19 56 



Mean 4 15 91 



So that the longitude of the observatory at York may be taken 

 as approximately true at 4m. 16s., to which we may add the 

 latitude as also approximately true 53° 58. 



If we refer back to the observations of Mr. E. Pigott, (who 

 resided in Bootham, York), which were made in the years 1783 

 and 1786, we find that he made his longitude as follows. 



M. s. 



1. By occultations of Stars by the Moon 4 27 



2. By an Eclipse of the Moon on Sept. 1 0th, 1783 4 16 



3. By observation of the transit of the Moon's bright limb, 



connected for the Moon's motion eastward 4 16 



4. By Eclipses of Jupiter's Satellites 4 6l 



17 30 



And considering them all of equal weight, the mean is 4 22,5 

 for the longitude of Mr. Pigott's Observatory West of 

 Greenwich. 



January 4th. Professor Phillips in the Chair. 



" On the Mineral Condition and general affinities of the 

 Zoophytes of the Chalk at Flamhorough and Bridling- 

 tony* — By Edw. Charlesworth, F. G. S. 



The Fossil Zoophytes which occur between Bridlington and 

 Flamborough-head constitute, in respect to their mineral condi- 

 tion, a very remarkable exception to the state in which we gene- 

 rally find remains of this class throughout the Chalk formation. 



* The details of the subject requiring uumeroas illustrations, an abstract only 

 of this paper is inserted. 



(Proceedings Y. P. 8., 1848.) 



