BIBLIOGRAPHY OF HERSCHEL's WRITINGS. 615 



Subject-Index. Philosophical Trans actions. Tear. Page. 



Marius. Simon: , IHOO 64 



Mars : drawiugs of 1781 127 



: on its poles, axis, figure, etc 1784 233 



: 24 (bawings 1784 235 



: the polar spot projects beyond the disk by its splendor 1784 237 



: polar spots are due to ice 1784 260 



: its atmosphere 1784 < 



< 272 



: results as to the position of its axis, etc 1784 273 



Mars' rotation time 1781 134 



Mars' spots are permanent 1781 119 



Maskel"VT^e : his proper motions of 36 stars 1805 233 



Maupertius : his theory of variable stars 1780 343 



Mayer: , 1782 157 



Mercury : observation of its transit of 1802, Nov. 9 -. 1803 214 



: is perfectly spherical 1803 217 



Messier's nebulae examined : (with drawings) 1784 440 



: 1814 284 



: 1818 431 



Methods of observing : limitation of magnifying power 1781 494 



: single eye-pieces better than double 1782 95 



: the telescope to be used depends on the work to be done 1782 82 



: distances of double stars 1782 99 



: the observer, the air, and the instrument must have the same tem- 

 perature 1782 120 



, . ■ ^- f -f ■ S 1782 174 



: determination of magniivmg powers < 



( 1783 9 



: employed in reviews of the heavens 1783 250 



: adjustmeuf of focus 1785 43 



: eifect of magnifying on very unequal double stars 1785 51 



: unequal double stars 1785 65 



: a star is not always best seen in centre of the field of view 1785 83 



: sweeps l^SS 458 



: effect of moisture on seeing - 1794 54 



: see Telescopes: investigation of the causes which often prevent 



their proper action 1603 



: determination of the diameters of the nuclei of comet.s, etc., by ( 1808 148 



comparison with globules of sealing-wax < 1812 116 



Method of limiting apertures : 1617 311 



Micrometer: used in 1781 - 1781 499 



: position (with a plate) 1781 500 



: (lamp) described 1782 163 



: (lucid disk, etc.) described ---- 1783 5 



: threads were silk and were 1" 13'" in angular dimension 1785 46 



MilkyWay: resolved IJ^^ f^ 



: its shape, drawing of it 1785 266 



: consists entirely of stars l^^l "^^ 



: the telescopic 1^' 1 ^ 



: example of its most crowded parts 179» 70 



• consists of stars very differently scattered from those about us. . 1802 480 



.^ , ,. 1814 282 



: its evolution 



1817 322 

 : general description 



? , 1817 302 



: in general 



Mimas: discovered 1789, Sept. 17 1"^^ 



214 



