106 



PROCEEDINGS OF THE AMERICAN ACADEMY 



Hour. 



5 



6 



7 



8 



9 



10 



11 



12 



Moon's Right Ascension. 



Moon's Declination. 



14 



o 



61 



61 45 



62 16 



62 47 



63 18 



63 50 



64 21 

 64 53 



5.22 

 14.75 

 27.01 

 41.99 

 59.61 

 19.93 

 42.94 



8.62 



31 

 31 

 31 

 31 



; o 



9.53^^ 



12.26 

 14.98 

 17.62 

 31 20.32 

 31 23.01 

 31 25.68 



21 



48.77 

 9 16.78 

 17 38.84 

 25 54,90 

 34 4.91 

 42 8.83 

 50 6.64 

 57 58.31 



8 28.01 

 8 22.06 

 8 16.06 

 8 10.01 

 8 3.92 

 7 57.81 

 7 51.67 



Damoiseau's 

 Moon's I Semidiam- 

 Ecj. Par. eler. 



54 



54 



33.58 

 32.82 

 32.07 

 31.32 

 30.58 

 29.86 

 29.16 

 28.51 



14 52.49 



52.28 

 52.07 

 51.87 

 51.67 

 51.47 

 51.28 

 14 51.10 



Three Iiuntlred and niuety-seventli meeting. 



March 28, 1854. — Semi-Monthly Meeting. 



The Vice-President, and afterwards the President, in 

 the chair. 



The Corresponding Secretary read a letter from the Trus- 

 tees of the Astor Library, acknowledging the reception of 

 Vol. V. Part I. of the Academy's Memoirs, and Vols, II, and III, 

 (as far as published) of the Proceedings; also a letter from 

 Rev, Charles Brooks on the Weather Law. 



Professor Levering exhibited a bioscope ; an optical instru- 

 ment for giving the motions of life to pictures, and illustrating 

 the great advancement of optical science. This instrument 

 combines the three important modern discoveries of the da- 

 guerreotype, the stereoscope, and the phenakistiscope. The da- 

 guerreotype gives a perfect picture, without solidity or motion ; 

 the stereoscope suggests the idea of solidity without motion ; 

 the phenakistiscope imparts life by motion. The bioscope 

 obtains perfect figures from the daguerreotype. By a stere- 

 oscopic arrangement of mirrors adapted to both eyes, the 

 figures acquire solidity ; and by the revolution of the phena- 

 kistiscope, the figures exhibit the motions of life. It requires 

 some practice to see all that the instrument is capable of 

 showing ; and the combination admits of considerable im- 

 provement. 



Professor W, B, Rogers made a communication on the natu- 

 ral coke found in the vicinity of Richmond, Virginia. This 



