Bulletin of January. 1909, and as we have exchanges with nearly 

 all the famous Scientific Bodies throughout the world, it proved a 

 material factor for the choice of Los Angeles as the place for the 

 Fourth Conference of the International Union for Co-operation in 

 Solar Research. 



In August, 1910, at this city, assembled a body of men and 

 women whose names are distinguished with the word Astronomy. 

 Eighty-nine in all, gentlemen and ladies, coming from Russia, 

 Germany. Austria, Italy, Sicily, Switzerland, Sweden, Holland, 

 France, Spain, England, Scotland, Canada and from all sections 

 of the United States, and representing fifty different observatories 

 and laboratories, from August 31 to September 4, around the 

 Sixty-Inch Reflector on the summit of ^Nlount Wilson, exchanged 

 ideas and discussed the great problems of the oldest of the 

 Sciences. 



An interesting report of this Convention, with portraits of the 

 assemblage, was given in our Bulletin of January, 1911. 



The exquisitely delicate labor upon this enormous disk has 

 been completed by Mr. Ritchie, who has few to equal him, and 

 none superior, in this scientific work, throughout the whole world. 

 The parabolic curve has been figured to three-one millionths of an 

 inch of perfection, and its focus is 42 feet. Five small mirrors, to 

 be used in combination with the large one, have been polished, and 

 the huge castings of the mounting have safely achieved their 

 perilous ascent over the many miles trail up to the nearly 6000 feet 

 elevation of ]Mount Wilson. 



Professor Walter S. Adams, one of the most accomplished 

 and advanced astronomers, has generously acceded to our request 

 for a description of this Great Reflector, and his article in this 

 Bulletin will be read with absorbing interest by all who delve in 

 the lore of the stars. 



A GRAPHIC account of the labors of Professor Albert B. 

 ■^^~^ Ulrey. Director of the Venice Marine Biological Station of 

 the University of Southern California, and one of the Directors 

 of this Academy, is presented in this Bulletin, and the fields of his 

 activities are shown in the annexed charts. 



The specimens of marine flora and fauna, gathered by him 

 throughout a period of five years have been preserved in a lasting 

 form, and so far as identified, labelled and placed in the Museum 

 of the University. 



The hydrography of many Stations, — their depth, tempera- 

 ture, currents and condition of the bottom, — has been recorded. 

 This work requires the greatest time, patience, accuracy and 



