33t Mr. Dehi Beche on iheGeographkalDistributioti of Organic 



The errors arising iVoni neglecting tliis Kictor will always be 

 within narrow limits. For the rigorous value of /3 we have 

 sin /3 = 6 sin (8—8') and by developing the series: 



,3= b {l-V) — -i sin /3' cotang y» — A sin /3» cotangy'^JJl^i^lJl ... 

 o 40 sin y2 



where the last term when a maximum for (3 = 10° does not 

 amount to a second ; the second, when a maximum, for 



/3 = 5° 4" 



= 10 34 



The error for A would be somewhat greater : here the deve- 

 lopment of the series is 



X= A + a(8-S')sec/3-4-i^^^\... 



^ ' ^ 6 tang J. 



For /3 = 5° the error is about 9"; for /3 = 10° about 82" 

 when a maximum. For the following tables, s has been as- 

 sumed at 23° 27'30". 



As an examj)le, let the longitude and latitude of Mars 

 1831, January, be required. The Ephemeris gives 



« = O'' 58' 33"-65 8 = + 6° 42' 0"'0. 



By these quantities we find from the table, 



A = 15° 53'-7 B = + 6° 15'-5 



a = + 3852 b = 0-9228 

 8 - B = + 26-5 /3 = + 0° 24''5 



a (8-B) = + 10-2 X = 16° 3'-9 



The rigorous calculation would have given /3 = 0° 24' 25" 

 and A = 16° 3' 54". 



XLIX. Notes on the Geographical Distribution of Organic 

 Remains contained in the Oolitic Series of the Great London 

 and Paris Basin, and in the same Series ojthe South of Trance. 

 Bij Henry T. De la Beche, F.R.S. <$-c. 



[Continued from page 268.] 



¥ T cannot have escaped the reader's observation, that many 

 ■*■ fossils are common to several parts of the oolitic series ; —to 

 show the various beds in which the same organic remains may 

 occur, and at the same time to convey an idea of the organic 

 contents of the oolitic series in general, I have formed the fol- 

 lowing table from the authorities already mentioned, and from 

 others that will be noticed in their places. Such a table must 

 necessarily be very defective, and can only answer tcmjiorary 

 purposes ; but it is hoped that it may be useful. 



Organic 



