184 



Scientific Intelligence. 



2. M, Westphal's 2'able of Variable Stars. — The variable stars hitherto 

 known are thirteen in number. The following table given by our author 

 contains their positions for 1820, the total period of their change, the ex- 

 treme intensities of their light, and the name of the astronomer who first 

 obserYed them. 



In a separate account of each star, the author explains in detail his ob- 

 servations and calculations. In ahnost all of them the increase of light 

 }8 more rapid than its diminution. 



Increase. Diminution. 



Whale, - - 40 days 66 days 



Perseus, - - 4 hours 4 hours 



Leo, - - 30 days 48 days 



Virgo, - 39 42 



Hydra, . - 43 83 



Hercules, - - 23 39 



Sobieski's Shield, - 19 42 



Lyra, _ - 3 3.4 



Antinous, - - 2.7 4.6 



Cygnus, - . 39 73 



Cepheus, . - 1.5 3.9 

 See Neneite Schrift, der Naiurforsch. Gesells in Danzig, vol. i. 2 cah. p. 3. 



MACNETISM. 



3. LebaiUiff^s Needle for showing- the smallest qnantity of Magnetism. 

 —This needle consists of two magnetised sewing needles placed at the two 



