( 121 ) 



B and this difference, as nnp;l)t he expeeted, is much greater for the 

 faint Ihaji for the hri^ht iiehiilae. 



It may be remarked I hat such a difference is not foimd — rather 

 the contrarv — in areas whicii in the northern galactic zone border 

 upon those mentioned, wiiere thei-efore the influence meant cannot 

 manifest itself so stronji;ly. It remains possible of course that the 

 number of nebulae in the direction /> is indeed smaller than in the 

 direction A ; but we cannot consider such a kxrge difference as 

 established where the disturbing influence is undoubtedly at hand. 



If we consider oidy the nortliern galactic hemisphere, then the 

 nebulae seem indeed to increase fairly gradually though not regularly 

 towards the Pole of the Milky Way. For the southern hemisphere 

 such an increase is also visible in the table of Stratonoff as far 

 as about — 60° galactic latitude. Stratonoff, however, constructed 

 his table omitting the two Nubeculae. Now it seems to me that for 

 such a statistics this omission is not justifiable. The Magellanic 

 Clouds must not at all be considered as j)atches torn off from the 

 Milky Way, which also appears from the fact that the nebulae 

 proper '), which are scarce in the Milky Way are four times more 

 numerous than tlie star clusters in the Magellanic Clouds (John 

 Herschel, Results Obs. Cape). As to their composition the Nubeculae 

 keep the middle between the Milky Way and the accumulations of 

 nebulae (sometimes intermingled with star clusters and stars) in Coma, 

 Pisces, etc. — and though the latter agglomerations are less dense 

 than the Clouds it is not allowed, in my o[)inion, to include these 

 agglomerations in our table and to exclude the (Jlouds. Especially 

 also because, as may be seen clearly on Stratonoff's own maps 

 (Publ. Tachkent, N". 2, Atlas, pi. 16 et 18; comp. Sidney Waters, 

 M. N. XXXIII, |). 558) the Nubeculae are connected with streams of 

 nebulae and not with the Milky Way. 



If, however, we include the Nubeculae into the statistics then 

 we must substitute my table B (table IV) for Stratonoff's own 

 table A for the southern gal. hemisphere : 



1) Where in this jiaper we speak of nebulae proper or nebulae without more, 

 we mean tlie relatively regular and well-defined nebulae ("white nebulae"), while 

 with diffused nebulae are meant the extensive, formless and according to tlieir 

 spectra gaseou.s masses ("green nebulae"). 



