October 21, 1892.] 



SCIENCE. 



237 



does not say who manufactured the plates which he used ; but 

 they measure four by five inches. With a steady, diffused glow 

 on an arch he has had very fair success, with an exposure of be- 

 tween forty seconds and five minutes. With a greatly agitated, 

 curtain-like display, and an exposure of only one minute, he lost 

 all detail. But a very sharp picture was secured, with an ex- 

 posure of six seconds, of one end of an arch, which was composed 

 of radiant streamers; the structure is distinctly shown. The 

 pictures were obtained between Jan. 4 and Feb. 1, this year. On 

 the night of Feb. 13-14, a heavy snow-storm prevented observa- 

 tions of the famous aurora of that date; but, as has already been 

 mentioned, a remarkable magnetic disturbance was recorded by 

 the needles. 



The scientific world will wish Dr. Brendel good luck in his 

 future endeavors, and will watch eagerly to see whether he finds 

 it practicable to determine the parallax of auroras by this method. 



James P. Hall. 



Brooklyn, N.Y., Oct. 8. 



BOOK-REVIEWS. 



The Horse : A Study in Natural History. By William H. Flower, 

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