Vol. 6, 1920 INTERNATIONAL ASTRONOMICAL UNION 
391 
''In this connection it may be stated that the Observatory of the Uni- 
versity of Michigan began some years ago the construction of a 24-inch 
refracting telescope for double-star work in the Southern Hemisphere. 
The mounting for this instrument was nearly completed five and a half 
years ago, when work upon it had gone as far as was practicable until the 
objective could be obtained. As soon as the glass for the objective can 
be obtained this instrument will be completed, and then taken to the 
Southern Hemisphere for double-star work and for other observations. 
No site has been definitely selected for this instrument. It will be taken 
to that place which promises the best results. 
W. J. HUSSEY." 
REPORT OF THE COMMITTEE ON STELLAR CLASSIFICATION 
Your Committee recommends the following proposal for adoption by 
the American Section, and presentation by its delegation at the interna- 
tional meeting at Brussels. 
CLASSIFICATION OF SPECTRA 
(a) That the methods of determining the spectral class, according to 
the Draper Classification, which have been developed by Adams and 
Kohlschiitter, be adopted as an extension of the international standard of 
classification. 
(b) That the notation of the Henry Draper Catalogue {Harvard 
Annals, vol. 91) be adopted in the case of stars of Classes R and N. 
(c) That the notation of the Henry Draper Catalogue be adopted for 
the spectra of gaseous nebulae, and that P50 be employed to denote spec- 
tra intermediate between gaseous nebulae and fifth- type stars. 
(d) That a series of standard stars be chosen, representing typical 
spectra, separated by not more than five divisions of the Draper scale 
(such as BO, B5, AO, etc.) and that reproductions of negatives of these 
spectra be published for the benefit of astronomers generally. 
{e) That the presence of the more noteworthy spectral peculiarities 
(such as bright lines, unusuaUy sharp or diffuse lines, and the peculiarities 
in intensity associated with bright or faint absolute magnitude, and with 
the Cepheid type of variation) be denoted by distinctives ymbols appended 
to the ordinary designation of the spectral class. 
(/) That a Committee on Stellar Classification be appointed by the 
International Astronomical Union, which shall undertake the preparation 
of the list and reproductions of standard spectra (recommendation (d)) 
and the formulation of the notation for spectral peculiarities (recommenda- 
tion (e)) after consultation with the most experienced investigators in 
this field. 
In explanation of {e) it may be noted that the use of new distinctive 
symbols for spectral peculiarities is proposed because the small Roman 
