4 BOHLIN, ON THE GALACTIC SYSTEM WITH REGARD TO ITS STRUCTURE. 
more conspicuous of the celestial objects, the material of which we dispose at present, 
in respect to these objects, may be regarded as chiefly homogeneous throughout the 
whole extent of the celestial sphere. After having constructed upon this assump- 
tion the charts of Globular Clusters, here reproduced [Plate 1], showing their concen- 
tration around a certain point of the Milky Way, I proceeded to search for further 
information on the subject. The only record on the distribution of the Globular 
Clusters I thus was able to find, is due to J. HERSCHEL and exhibited' by him by 
the observation of »the extraordinary display of fine, resolved, and resolvable Globular 
Clusters in the Southern nebulous System, which occurs between 16"45” and 19" in 
RA in the region occupied by Corona Australis, the body and head of Sagittarius, 
the tail of Scorpio with part of Telescopium and Ara.> »>»This»>, he adds, »is cer- 
tainly something beyond a mere accidental coincidence. >» ä 
In order to obtain a distinct representation of the objects without drawing 
meridian- and parallel-cireles on the charts, a special chart-constructing-circle was 
employed, consisting of a bar with a polar distance scale and a printing piece, 
moveable along it, the right ascensions being immediately read and settled on at 
the borders of the chart. The projection of the scale is the isographic one, giving 
for annular intervals of the chart the same areas as for zones of the sphere, corres- 
ponding to the same limits of polar distance. In this way equal areas of the projec- 
tion represent equal ones on the sphere. 
The positions and the descriptions of the several objects, constructed in the 
charts, are taken from the New General Catalogue of Nebule and Clusters of Stars 
for 1860.0o by J. LE. E. Dreyer? 
Thus having constructed the two charts representing the Clusters of the 
southern and northern hemispheres and containing even the general trace of the 
Milky Way, as represented by a line in these charts, the general feature of distri- 
bution of the objects around a point [2 = 17"40"; p =125”], situated in the Milky 
Way, in the constellation of Telescopium, at once revealed itself. 
The four magnitudes of dots, employed in these charts, refer to HERSCHEL'S 
designations vL, L, pL, S [very large, large, pretty large, smalll. At a more assi- 
duous inspection of the spherical conglomerate, made up of these Globular Clusters, 
and looking away from the two Maghellanic Clouds, which seem to contain a consi- 
derable number of them, I was struck by some of the objects, generally very faint 
and appearing to lie outside the limits of the general assemblage of the bodies. The 
first object, met with in this way, was the cluster N. G.C. 628 [G. C. 372, Messier 74, 
038600 — 129” 11"; p 10600. — 14" 56'.0], described as. Globular ,Cluster, EF; vL, R, vg, psmibMi 
rr. This object has been photographed by Sir Isaac ROBERTS” and proves to be 
a very regular spiral nebula with numerous knots included, of which a reproduction 
is given here. 
! Results of Astronomical Observations. made during the vears 1834, 3,6, 7, 8 at the Cape of good Hope 
|pag. 1361. 
? Memoirs of the Royal Astronomical Society, Vol. XLIX Part I. 
"TJ, Roberts, Photographs of stars, star-clusters, and nebule, Vol. II Plate XI, 
