

KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 60. N:0 8. 



Table IX. 



39 





Distribution of stars in and near Messier 33 as resulting from counts on an Up- 

 sala Astrographic plate. 



The cross designates the centre of the plate and bas the coordinates: 



a=l ; '29 m 5 (1875,o) 

 8 = ;- 29° 58'. 















ne 



sqi 



uare has 



a s 



side 



i of 9' 



.0. 











15 



8 



8 



13 



4 



ö 



7 



10 



3 



11 



5 



- 



5 



10 









[7] 





13 



6 



10 



6 



7 



16 



13 



11 



10 



9 



13 



9 



9 



8 



12 



13 



10 



8 



10 



16 



5 



9 



8 



9 



4 



12 



11 



9 



12 



9 



10 



9 



12 



12 



13 



9 



10 



9 



10 



6 



7 



9 



7 



7 



10 



13 



13 



12 



7 



6 



11 



5 



11 



12 



12 



10 



10 



13 



9 



6 



10 



8 



10 



9 



7 



10 



11 



7 



11 



10 



7 



6 



10 



3 



14 



13 



10 



II 



10 



5 



9 



12 



11 



7 



6 



13 



10 



9 



9 



12 



9 



9 



8 



11 



11 



9 



7 



8 



10 



8 



10 



11 



12 



7 



6 



12 



13 



7 



8 



II 



14 



9 



12 



15 



6 



14 



7 



10 



8 



7 



7 



11 



14 



13 



10 



4 



13 



8 



13 



14 



11 



10 



8 



9 



10 



15 



10 



13 



7 



12 



12 



12 



12 



6 



12 



10 



11 



12 



12 



14 



10 



6 



11 



11 



7 



9 



G 



6 



12 



10 



7 



6 



10 



9 



8 



6 



11 



5 



15 



11 



9 



8 



15 



8 



12 



11 



10 



7 



10 



8 



11 



7 



11 



13 



9 



11 



10 



10 



12 



9 



7 



7 



6 



9 



9 



11 



9 



10 



9 



8 



12 



7 



5 



12 



14 



11 



12 



10 



11 



9 



10 



8 



9 



13 



7 



10 



14 



6 



10 



11 



9 



8 



15 



9 



13 



13 



17 



17 



8 



13 



8 



13 



9 



8 



13 



13 



13 



13 



13 



10 



10 



15 



9 



10 



14 



11 



8 



9 



10 



10 



14 



7 



6 



11 



10 



9 + 8 



10 



11 



II 



10 



11 



8 



14 



10 



10 



10 



11 



8 



7 



10 



13 



11 



17 



10 



11 



14 



10 



II 



11 



8 



10 



12 



5 



11 



9 



7 



6 



10 



14 



8 



11 



14 



9 



10 



10 



13 



6 



8 



12 



9 



14 



13 



12 



8 



11 



10 



5 



12 



8 



13 



12 



5 



8 



10 



10 



13 



10 



8 



7 



10 



15 



8 



9 



10 



9 



9 



10 



10 



15 



12 



10 



8 



10 



10 



11 



9 



11 



12 



12 



16 



9 



8 



8 



17 



9 



11 



13 



12 



11 



11 



9 



11 



9 



12 



11 



13 



4 



10 



12 



7 



10 



6 



8 



14 



10 



8 



12 



18 



9 



9 



11 



10 



11 



12 



10 



14 



15 



8 



6 







6 



7 



9 



10 



5 



9 



13 



10 



15 



10 



12 



12 



9 



22 



16 



10 



6 



9 



12 



11 



10 



9 



9 



11 



16 



11 



11 



11 



9 



15 



12 



11 



11 



17 



8 



G 



10 



8 



9 



8 



8 



10 



8 



9 



17 



12 



8 



11 



14 



11 



12 



10 



9 



9 



12 



5 



9 



G 



9 



11 



13 



10 



14 



12 



11 



9 



12 



8 



3 



13 



15 



13 



9 



13 



7 



11 



13 



9 



10 



11 



6 



10 



13 



12 



14 



12 



14 



12 



13 



15 



10 



10 



15 



11 



7 



8 



7 



13 



10 



9 



14 



12 



10 



14 



14 



13 



9 



7 



11 



9 



15 



12 



8 



6 



10 



11 



17 



8 



6 



12 



14 



12 



15 



11 



11 



9 



9 



7 



11 



9 



11 



9 



[10] [13] [10] [1-2] 



13 



10 



16 



16 



11 



10 



13 



10 



t 



[7] [11] [8] 



[5] 



[9] 



[8] 



It is easy to imagine the origin of the above-mentioned channels free from 

 nebulae about M 33 as caused by influence from absorbing media about the nebula. 

 On one of my plates taken with the tvvin 6-inch astrographic telescope at the Upsala 

 Observatory exposed for 5 hours, I have therefore counted the stars falling within 

 squares with a side of 4 mm. (9',o). (Table IX). 



A similar count has been performed on the Wolf-Palisa chart No. 62, Table 

 VIII. Owing to the difficulties in the latter case to distinguish between small ne- 

 bulae and stars, I have not wanted to assign any great importance to these counts. 



