OF ARTS AND SCIENCES. 323 



The first column of the left-hand page gives a provisional number for 

 designating the star. This number is taken from Schonfeld's Cata- 

 logue when the star occurs there ; in other cases, a letter is added to 

 the number. The second column contains numbers from the Photo- 

 metric Catalogue called Harvard Photometry, and published in Vol- 

 ume XIV. of the Annals of the Harvard College Observatory. The 

 following columns contain the usual designation of the star, its right 

 ascension and declination for 1875, magnitude at maximum aud mini- 

 mum, and period in days. 



Tiie first column of the right-hand page repeats the number to be 

 used for thd provisional designaiion of the star. The second gives the 

 class to which the star belongs, upon the system of classification em- 

 ployed in the Proceedings of the American Academy of Arts aud 

 Sciences, XVI. 257. Upon this system. Class I. includes temporary 

 stars ; Class II., stars undergoing large variations in periods of several 

 months ; Class IH., irregularly variable stars, undergoing but slight 

 changes in brightness ; Class IV., variable stars of short period, like 

 y8 Li/)-cB or 8 Cephei ; Class V., Algol stars, or those which at regular 

 intervals undergo sudden diminutions of light, lasting for a few hours 

 only. The third column gives the nam^e of the discoverer, and the 

 fourth column the date. 



The last column contains the number of nights on which each star 

 was observed by the astronomer whose designation is attached to the 

 number. The abbreviations employed have been explained above. 

 The designation Sk. is preceded by three numbers, which relate re- 

 spectively to observations made in 1883, 1884, and 1885. A dash 

 replaces a number v\rhen some observations are known to have been 

 made, but their number has not been ascertained. 



Table I. is followed by a series of remarks containing observed 

 dates of maximum and minimum, and other information derived from 

 the observers with regard to particular stars. 



Table II. indicates the progress of observation of stars suspected or 

 known to be variable, but not included in Table I. for reasons previ- 

 ously explained. The stars are designated in the first column by Mr. 

 Chandler's provisional numbers, as in the previous statement. The 

 number is replaced by a dash when the star has not yet been entered 

 in Mr. Chandler's catalogue. Tlie second and third columns give the 

 right ascensions and declinations of the stars for 1875. The fourth 

 column gives the number of observations made by each observer, as in 

 the last column of Table I. The abbreviations are likewise the same. 

 The letters in the last column refer to the remarks on page 334. 



