514 



SCIENTIFIC RECREATIONS. 



Pyramus and Thisbe with the dog and the thorn -bush ; and in the Tempest 

 the same idea is mentioned by Caliban. Readers of Longfellow will recall 

 the lines how " the good Nokomis answered " Hiawatha, who asked about 



the moon 



" Once a warrior, very angry, 

 Seized his grandmother, and threw her 

 Up into the sky at midnight. 

 Right against the moon he threw her, 

 'Tis her body that you see there." 



A Mare Cri- 



sium. 

 B Palus Som- 



nii. 

 C Mare Sereni- 



tatis. 

 D Mare Tran- 



quillitatis. 

 E Mare Foecun- 



ditatis. 

 F Mare Necta- 



ris. 



G Sinus Medii. 

 H Mare Vapo- 



rum. 



I Lacus Mortis. 

 J Mare Frigo- 



ris. 

 K Mare I m- 



brium. 

 L Oceanus Pro- 



cellarum. 

 M Mare Hu.no- 



rum. 



N Mare N u- 

 bium. 



S in us Iri- 



dum. 



a Apennine 



Mts. 



b Caucasus. 

 c Carpathians 

 d Pyrenees. 

 e Altai Mts. 

 f Riphaen Mts. 

 g Doerfel Mts. 

 h Leibnitz Mts. 



1 Corderillas. 



j D ' A 1 e mbert 



Mts. 



k Taurus Mts. 

 / Haemus Mts. 

 m Alps. 



1 Clavius. 



2 Maginus. 



3 Maurolycus. 



4 Stofler. 



5 Tycho. 



6 Longomonta- 



7 Wilhelm I. 



8 Schiller. 



9 Schickhardt. 



10 Hainzel. 



11 Furnerius. 



16 Zagut. 



17 Apiauus. 



18 Walter. 



19 Hell. 



20 Pitatus. 



25 Pecavius. 



26 Vendelinus. 



27 Langrenus. 

 23 Fracastorius. 

 29 Tneophilus. 



34 Albufeda. 



35 Albategnius. 



36 Hipparchus. 



37 Ptolemy. 



38 Alphonsus. 



"***> 

 PX & *~^ - 



^ O 06 ^ 



&?*#* 

 - *rf#W> 



/W- f V7 ^TV^T 1 ^ N> A 



A 



o ^^^ ! ^^= = 4i^i 



^^-0^ ^^-^W 

 i"=i^r ^=r ^ / 



?* 



=S^ 551 



^^^;^ V 



K O- r ~ 1 ^=l 



r 88 



82^ <$ 



85' 





12 Metius. 



13 Fabricius. 



14 Riccius. 



15 Piccolomini. 



Fig. 565. "Map of Moon showing principal formations. 



21 Hesiodus. 



22 Capuanus. 



23 Ramsden. 



24 Vieta. 



30 Cyrillus. 



31 Catharina. 



32 Sacrobosco. 



33 Almanon. 



39 Purbach. 



40 Regiomontanus 



41 Thebit. 



42 Arzachel. 



43 Bullialdus. 



44 Lalande. 



45 Mosting. 



46 Herschel. 



47 Gassendi. 



48 Mersenius. 



49 Sirsalis. 



50 Grimaldi. 



51 Riccioli. 



52 Hevelius. 



53 Condorcet. 



54 Taruntius. 



55 Proclus. 



56 Cleomedes. 



57 Romer. 



58 Posidonius. 



59 Plinius. 



60 Julius Caesar. 

 6r Manilius. 



62 Godin. 



63 Agrippa. 



64 Triesnecker. 



65 Bode. 



66 Gambart. 



67 Eratosthenes*. 



68 Copernicus. 



69 Reinhold. 



70 Landsbcrg. 



71 Kncke. 



72 Kepler. 



73 Marius. 



74 Archimedes. 



75 Timocharis. 



76 Euler. 



77 ArUtarchus. 



78 Herodotus. 



79 Struve. 



80 Messala. 



81 Mare Hum- 



boldtanius. 



82 Atlas. 



83 Hercules. 



84 Endymion. 



85 Eudoxus. 



86 Aristoteles. 



87 Linne. 



88 Autolycus. 



89 Aristillus. 



90 Cassini. 



91 Plato. 



92 Helicon. 



93 Pythagoras. 



But modern scientific research has exploded all these charming old myths, 

 and laid bare the facts for us. We must now resume. 



The moon moves around us in 2; d ; h 43 ii'46i s . Its diameter is 

 about 2,160 miles, and it is much less dense than our earth, and so the force 

 of gravity is less there than here. Its mean distance from us is 238,833 

 miles. The moon goes through certain changes or phases every twenty-nine 

 days or so ; and while rotating on its own axis our satellite goes round the 

 earth, so that we only see one side of the moon, inasmuch as the two 



