2Y4; SCIEXTIFIC NEWS, 



Remarks on the The grain of this ftone pafles by infenfible fiiades from a 

 ''^^ft "^f An-^ high degree of fineneCs, until it become undiftinguiftiable from 

 tiiai. that of the common columnar bafaltes. 



The name of Siliceous Bafah, which Dr. Richardfon em- 

 ploys, was firft given to this foffil by Mr. Piflet of Geneva, 

 when he vifited Porirufh, in a tour through Ireland two years 

 ago. He confidered it as a variety of bafalt, containing a 

 greater proportion of yj/zca than ufual. 



The ftrata of filiccous bafalt, both at Portrufli and iht 

 Skerry iflands, generally alternate with ftrata of equal thick- 

 nefs of a coarfe-grained bafalt of a grey colour. The ma- 

 terials of the ftrata grow into each other, fo as to form one 

 folid ma(s, from which it is eafy to quarry pieces in the con- 

 fine of the two ftrata, with a part of each adhering; but the 

 coarfe bafalt, as it approaches very near to the fine, always 

 abates fomewhat of its coarfenefs ; yet the line of demarcation 

 ts left completely diftind. 



(The conclufion in our next. J 



SCIENTIFIC NEWS, 



Almanack printed at Conjiantinople, 



Almanack ^ OR the fifft time an almanack has been printed at Conftan- 



printed at Con- tinople, under the diredion of Abdorahman. The printing- 

 office was eftablilhed in 1716, by Said (who had been at Paris 

 with his father, the ambalTador), and by Ibrahim, an Hunga- 

 rian : Achmet the Third patronized them, and tbey printed 

 many books ; but an almanack was never before printed. 



^ntiaople. 



Ohfervatory at Bavaria, 



F»'^siian obftr- The Eledor of Bavaria, a few months before the arrival of 

 vatoty. j}jg prench armies, caufed an obfervatory to be ere6led in the 



neighbourhood of Munich. The filuation chofen for its con- 

 firuflion, lakes in an exlenfive horizon. Profeflbr Seyfer, a 

 celebrated aftronomer of Gottingen, was nominated direflor 

 Oi this eftablilhraent. 



FJlahliJImcRts 



