100 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Ist. By transport of cbronoincters. Five chronometers were carried hy the expedition from 

 New York to San Francisco, and kept running constiintly. These were in cliar<je of Mr. Upton 

 for nearly the entire time, and their comparisons, as well as the computations relating to time 

 and longitude, were made by him and are detailed in his report. Time-sights with the sextant 

 were obtained by Ensign Brown at Colon, and at Caroline Island and Honolulu by Mr. Upton. 

 The entire expedition is indebted to Mr. Upton for the care and regularity of his work. He also 

 made many of the preliminary reductions of the time observations with the transit, and in fact 

 cheerfully assumed, in addition to his regular work, nearly all of the routine work, which was 

 not originally assigned to him. ' 



L'd. By moon culminations. Corresponding observations were made at the United States 

 Naval Observatory and at Caroline Island by Mr. Treston. These have been reduced by Mr. 

 Upton. 



(H.) Time signals during totality. 



For the photographic operations of the English expedition an elaborate programme of time 

 signals was necessary for the twenty-five minutes including totality, and this thankless but impor- 

 tant duty was assigned to Midshipman Fletcher, U. S. N., who performed it in his usual 



thorough manner. 



(I.) Meteorological observations. 



In connection with his full series of hourly meteorological observations, Mr. Upton undertook 

 a special series during the progress of the ecliiise. For details in regard to these I must refer to 

 his imi)ortant reports on the subject. 



(J.) Photographic observations. 



The two English observers were expected to carry out a most elaborate programme, 

 iuxolving the exposure of over sixty plates with three instruments. To aid them in their work 

 Lieutenant Qualtrough, U. S. N., volunteered to take charge of the photoheliograph, which he 

 did with the assistance of Seaman Gunner Horace Yewell. 



(K.) Miscellaneous observations. 



Observations on the botany and zoology of Caroline Island were made during our stay on 

 the island by various members of the party, especially by Dr. Dixon and Mr. Upton. Their 

 results are given in the appropriate place. I would especially refer to the careful survey of the 

 island which was made by Midshipmen Fletcher and Doyle, under the direction of Lieutenant 

 QuALTROUGH. The principal results of this survey are given in the map of Caroline Island. 



VII.— EFFORTS ON THE ECLIPSE OF MAY 6, 1883. 

 («) liEFORT OF nWFESSOE EDWARD S. HOLDEN. 



To Professor C. A. Young, 



Chairman of the Eclipse Committee of the National Academy of i<cicnces : 



Mv Dear Professor Young: In accordance with the instructions of your committee I 

 confined my work at the eclipse to the search for a possible Viclcan or Vulcans, such as were reported 

 by Prof. J. G. Watson and Prof. Lewis Swift at the eclipse of 1878. 



By the kindness of the regents of the University of Wisconsin I was allowed the use of the 

 6-inch Clark telescope of the Washburn Observatory. This telescope formerly belonged to Mr. S. 

 W. BuRNHAM, and by means of it over four hundred double stars have been discovered, which 

 is a sufficient proof of the excellence of its objective. I employed in connection with it the zone 

 eye-piece of the ISi-inch refractor of the Washburn Observatory. This gave me a magnifying 



