468 Dr. Heeschel’s Catalogue of One 2 \ 'houfand 
even in bright moon-light nights, to fee occafionally fome of 
the moft feeble of the former, when the latter could not by 
any means be perceived. 
Perhaps it will not be difpleafing to thofe who may look out 
for fome of the objects contained in this catalogue, to know 
that the pictures which were given in a former Paper, repre- 
fenting the various fhapes and appearances of feveral nebulae, 
have been adtually taken from nature, by Drawings made of 
them while I had them in view ; I have therefore added a 
reference to thefe figures, as the defcriptions of the original a 
which they rep refen t occur in their order in the catalogue. 
Arrangement of the columns , and explanations of the 
abbreviations . 
The fir ft column contains the clafs and number of the 
nebulae. 
In the fecond are the dates when the nebulae were firft 
obferved. 
The third column contains the ftar, or other objedt, by 
which the place has been determined. 
In the fourth column the letter p or f {hews that the nebula 
is either preceding or following the ftar. 
In the fifth is the time, in fidereal minutes and feconds, by- 
how much it precedes or follows the fame ftar. 
The letter n or f, contained in the fixth column, denotes 
that the nebula is north or fouth of the determining ftar. 
In the feventh is the quantity, In degrees and minutes, by 
how much the nebula is more north or more fouth than the 
fame ftar. 
The eighth column contains the number of obfervations that 
have been made of each nebula ; and it is to be noted, that 
6 the 
