its atniospliero I7514 '. 



BIBLIOGRAPHY OF IIERSCHEL's WRITINGS. Glo 



Subject-Index. Philosophical Tuaxpactio.vs. Year. Pajie. 



Marius. Simon: l-iio ,;4 



Mars : drawinjr.s of 17H1 i'>7 



on its poles, axis, liguro, etc 17pj4 233 



'24 (Irawiugs 17^4 035 



the polar spot projects beyond tlie disk by its splendor 17d4 237 



polar spots are due to ice 1784 2G0 



271 

 272 



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



Mars' I'otation time 17,<1 1:54 



Mam' spots are permanent H.-^i ipj 



Maskelyne : liis proper motions of 36 stars 1805 233 



Maupertius : bis tbeory of variable stars 1780 343 



Mayer: 1782 157 



Mercury : observation of its transit of 1802, Nov. 'J 1803 214 



: is perfectly spherical 1803 217 



Messieu's nebnliB 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 



, , . ,. ^ .^ . < 1782 174 



: determination 01 magmtyi iig powers < 



(1/83 9 



: employed in reviews of the heavens 1783 250 



: adjustment of focus 1785 43 



: effect 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 held of view 1785 83 



: sweeps I~i36 458 



: effect of moisture on seeing 1794 54 



: see Telescopes: investigation of the causes which often prevent 



their proper action 1803 



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



comparison with globules of sealing-wax C 1812 116 



Method of limiting apertures : l^^l' 311 



Micrometer: used in 1781 ^''^^ ^^^ 



: position (with a plate) 1~'^1 500 



: (lamp) described ^ ''^"^ ^''"^ 



: (lucid disk, etc.) described 1~*' •' 



: threads were silk and were 1" 13'" in angular dinu-iision 1785 46 



Milky Way : resolved 



general description 

 in general 



214 



1784 4:J8 



1791 71 

 77 



its shape, drawing of it 1"-"* '^^° 



consists entirely of stars 



the telescopic ^'^] 



example of its most crowded parts 1'*^^ '^ 



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



, .• 1*14 282 



its evolution 



Mimas : discovered 1789, Sept. 17 



1.^17 322 

 1817 302 



1790 :o 



