2] 



ON THE PERTURBATIONS OF URANUS. 



37 



HYPOTHESIS II. 



Ancient Observations. 



Year. 



1712 -1337 + 211-9= +78-2 



1715 -1177 + 191-5= +73-8 



1750 + 85-2-134-4= -49-2 



1753 + 73-8-122-2= -48-4 



1756 + 59-1-105-2= -46-1 



1764 + 27- 36-4= -33-7 



1769 43-1+ 20-8= -22-3 



1771 - 69-9+ 54-7= -15-2 



Modem Observations. 



Year. 



1780 - 133-10 + 1 35-9 8 =+ 2"-88 



1783 -149-47 + 157-87=+ 8'40 



1786 -160-15 + 172-99= +12-84 



1789 -164-52 + 180-64= +1G-12 



1792 -162-30+180-58= +18-28 



1795 -153-59 + 173-07= +19-48 



1798 -138-87 + 158-86= +19-99 



1801 -118-95 + 139-08= +20-13 



1804 - 94-96 + 115-21 = +20-25 



1807 - 68-25+ 88-85 =+20-60 



1810 - 40-33+ 61-61= +21-28 



Year - // ,/ // 



1813 -12-72+ 34-91= +22-19 



1816 +13-08+ 9-88= +22-96 



1819 +35-71- 1274= +22-97 



1822 +54-04- 32-68= +21-36 



1825 +67-18- 50-08= +17-10 



1828 +74-52- 65-37=+ 9'15 



1831 +75-74- 79-21= - 3'47 



1834 +70-85- 92-31= -21-46 



1837 +60-08-105-25= -45-17 



1840 +43-98-118-38= -74-40 



52. Comparing these with the corrections of mean longitude derived 

 from observation, we find the remaining differences to be the following : 



