S60 
phenomenon, which, in other circum- 
ftances, might be imputed to an atmo- 
{phere. 
Xi. PLANETARY NEBULA, and XII. 
PLANETARY NEBULZ WITH CENTERS. 
TVhefe involve alfo, great difficulties. The 
former may perhaps be allied to nebulous 
ftars. . For fhould the planetary nebula, 
with lucid centers, bean intermiditate {ep 5 
between planetary nebule and nebulous 
ftars, the appearances of thefe different 
fpecies, when all the individuale of theni 
are fully examined, might throw a con- 
fiderable light upon the ‘fab ject. 
Such is the outline of this very inge- 
nious paper, which is followed by a ca- 
Correé? Lift of New Publications. 
[ May f, 
talogue of soo additional new nebula, 
and clufters of ftars, divided into eight dif- 
ferent claffes. 
In a very ingenious paper by the Rev. 
Mr. HeEttins, * Of the Re&ification of 
the Conic Seftions,’” we have only the 
firft part, namely, that which treats of 
the eae} which is divided into 
three fetions : the firff containing the in- 
veftications of the feveral fertes ; the /e- 
cond, the methods of computing the va- 
lues of the conftant quantities by which 
the afcending feries differ from the de- 
{feending ones ; and the third, examples 
of their ufe, by way of illuftration, 
LIST oF tHe NEW PUBLICATIONS in APRIL, 
xe As the List of New I 
ONLY COMPLETE 
that can be ufeful te tbe 
that Authors and Puolifbers vill coni 
(po? paid), and they will always be j 
— os 
Publications, contained in the Monthly Magazine, is the 
LIST’ PUBLISi H 
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ED, and confequently the only one 
ofes of general reference, it is requested 
inue to communicate Notices of their Works, 
virhfully inferted FREE of EXPENCE. 
a 
BIOGRAPHY. 
Account of the Life and Writings of Tho- 
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lofophy in the Univerfity of Glafgow. By 
Dugald Stewart, F.R.S. $vo. 220 pages. 9s. 
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Eccentric Biography; or, Memoirs of ree 
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Fir 
