120 MEMOIR OF AUGUSTUS DE MORGAN. 



1844. men, who at the end of the session presented to him a 

 handsome copy of Wilkinson's Ancient Egyptians. The 

 letter accompanying the gift is signed with names of 

 Henry Eobert Reynolds, Joseph Eees, Richard Holt 

 Hutton, and C. Howard. 



In this year the Useful Knowledge Society came to an 

 end, having completed its work. Its farewell address has 

 been already mentioned. Mr. De Morgan's last under- 

 taking for it was a book entitled The Globes Celestial and 

 Terrestrial, written as a description of the Society's globes, 

 published in 1844. 



Maiby'8 The Society, which had already brought out the ' Maps 



of the Stars, 5 had turned its attention to the want of accu- 

 rately made globes of the heavens and the earth. These 

 were constructed by Mr. Malby, under the direction of 

 several men of Science. The celestial globe needed most 

 revision and improvement. Up to the year 1828 the 

 21 -inch globe by Gary and the 18-inch globe by Bardin 

 were the best in use ; and of these two, Gary's, ' having 

 annexed to every star its proper numerical or charac- 

 teristic valuation,' 1 was judged to be the best. Both 

 were founded on Wollaston's Catalogue of 1789; and 

 Gary's globe contains the stars extracted from Flamsteed's 

 Catalogue by the two Herschels. 



Mr. Baily had laid down, though not with the full 

 alteration which he thought necessary, the lines which 

 bound the constellations. Sir J. Herschel, being appealed 

 to by my husband on behalf of the nebulae, wrote : 



Why globe-makers will persist in laying down nebulae of 

 Classes II. and [II. is to me astonishing. There are but half 

 a dozen of Messier's and my father's 1st class which can be seen 

 with the naked eye, and the 2nd class ones are for the most part 

 invisible with a 3 -inch object-glass. The per-centage of Dunlop's 

 nebulae which can be seen with the naked eye is still smaller. 



1 Letter from Mr. J. W. Woollgar, of Lewes, to the Philosophical 

 Magazine. 



