Ch. XIIL] 



JNTRICITIES 



29* 



•om 



and the results given in the other 

 computed by my friend Mr 



Carrick Moore, 

 knowledge has rendered me 



w ho by his mathematical 



and geological 



climate 



me 



enquiries on cnange* ox uu^ - * * ^ 



third and fourth columns, m Particular ^vH ^ 

 more clearly to appreciate the variations m temperature 

 more cieaiy ^ fip . ure s in the second column, 



which are indicated by the figures 



A glance at this table will show tha there P ^ 



million 



i. • -4- r ^ tV»P pnrtVs orbit for a million 

 Tahl. — the variations m the excent ^^^^ such variation, 

 years before a.d. 1800, and some of the climatal ettcctsow^ 



3 



Number of 

 years before 



A.D. 1800. 



Excentri 



city of 

 orbit. 



Differ- 

 ence of 

 distance 

 in mil- 

 lions of 

 miles. 



4 



5 



C> 



Number 



of winter 



days in 



excess. 



Mean of 



hottest 



month in 



lat. of 

 London. 



Mean of 



coldest 



month in 



lat. of 



London. 



D 



(a 

 C b 



B 



A 



1,000,000 

 950,000 

 900,000 

 850,000 

 800,000 

 750,000 

 700.000 

 650,000 

 600,000 

 550,000 

 500,000 

 450,000 

 400,000 

 350,000 

 300,000 

 250.000 

 210,000 

 200,000 

 150,000 

 100,000 

 50,000 



0, 



0151 



0517 

 0102 



0747 

 ■0132 



•0575 



•0220 



•0226 



•0417 



•0166 



•0388 



•0308 



•0170 



•0195 



•0424 



•0258 



•0575 



•0567 

 •0332 



•0473 



•0131 



•0168 



2§ 



1* 

 13* 



10} 



4 

 4 



3 



7 



3 



73 

 «4 



4 1 



10* 



10* 

 6 



84 



3 



7'3 

 251 



49 

 36*4 



6-4 

 27'8 

 10-2 



11 



20*3 



8 

 18'8 



15 



8-2 



95 



20-6 



12*5 



27'8 

 27*7 

 16*1 

 23 

 6-3 



8-1 



83° F. 



21° F. 



109° 



3° 



80° 



23° 



126° 



-7° 



82° 



22° 



113° 



0°*6 



87° 



17° 



88° 



16° 



101°'9 



7°9 



84° 



20° 



99° 



9° 



94° 



13° 



84° 



20° 



86° 



18° 



102° 



7° 



90° 



15° 



113° 



0°.7 



113° 



l°-9 



95° 



12° 



105° 



5° 



82° 



22° 



K4° 



20° 



EXPLANATION OF THE TABLE. 



Column 1. Division of a million years preceding 1800 into twenty equal parte. 



Column 2. Computed by Mr. James Croll by aid of Leverner's formula, gives 

 the excentricity of the earth's orbit in parts of a unit equal to the mean distance or 

 half the longer diameter of the ellipse. 



Column 3. Which, together with the three following columns, has been computed 



