^70 



100 



(<ö. 352.) »When we see«, fagt 8ir 3ol)n ^erfc^el, )m\ 

 ihe Coal-sack (near « Crucis) a sharply defined oval space free 

 Irom Stars, it would seem much less probable that a conical or 

 tubulär hollow traverses the whole of a starry Stratum, conli- 

 nuously extended irom the eye oulwards, than Ihat a distant 

 mass of comparatively moderate thickness should be simply por- 

 föratcd from side lo side « Outlines § 792 p. 532. 



• (©. 353.) Lettre de Mr. Hooke ä Mr. Au z out xw 

 ben Mem. de l'Academie 1666 — 1699 T. VII. Partie 2. p. 

 30 «itb 73. 



^ (@. 353.) .^oömo^ 5^b. I. e. 161. 



