Vol.. 6, 1920 INTERNATIONAL ASTRONOMICAL UNION 
351 
of determinations of longitude by wireless at widely distributed stations, and report 
on what seems to be the proper time and method for such undertakings. 
Committee on Solar Radiation— Mr. C. G. Abbot was asked to prepare a report on 
solar radiation. 
Committee on the Spectroheliograph. — The Mount Wilson Observatory was asked to 
prepare a report on work with the spectroheliograph. 
Committee on Reform of the Calendar. — R. T. Crawford, Chairman, W. W. Campbell, 
Harold Jacoby. 
Another subcommittee was appointed at a later date, as follows: 
Committee on Stellar Parallaxes. — Frank SchlEsinger, Chairman, W. S. Adams, 
S. A. Mitchell. 
The American Section met again in the oflfiice of the National Research 
Council on June 23 and 24, to receive and act upon the reports of the 
technical subcommittees, to consider questions of policy, and to instruct 
the delegation which would represent the Section at Brussels. Twenty 
members of the Section were present. The reports of the subcommittees, 
presenting the aspects of their subjects which were then prominent in the 
minds of astronomers, and suggesting promising procedure for the im- 
mediate future, were of a high order of excellence. They are appended 
to this report in the form in which they were adopted by the Section. 
The discussions, conducted with enthusiasm and frankness, were extremely 
valuable. 
A joint meeting of the American Section with the proposed International 
Geodetic and Geophysical Union (Major William Bowie, Chairman) 
was held on June 24. 
The delegation of astronomers sailed from New York on June 30 and 
reached London on July 7. The next ten days were devoted profitably 
and with unusual pleasure to renewing old scientific acquaintances and 
making many new ones, to learning of progress in astronomy and the re- 
lated sciences made in Great Britain during the war period, to discussing 
with our British colleagues the many problems coming up for considera- 
tion at the Brussels Conference, etc. 
The President and Council of the Royal Astronomical Society had most 
kindly arranged by cable that the members of the American delegation 
should attend and address a special meeting of the Society on the after- 
noon of July 11. At this meeting, under the presidency of Professor 
Fowler, each member of our astronomical delegation, and likewise Dr. 
L. A. Bauer, Secretary of the Geophysical Section, addressed the Society 
informally on the scientific subject which at that time especially interested 
him. This meeting had been preceded by a reception in the rooms of the 
Society, which gave opportunity to meet many British men and women 
whose names had long been familiar. 
Opportunities to observe the equipment and work of the Royal Ob- 
servatory at Greenwich, of the University observatories at Cambridge 
and Oxford, and of the laboratory of Professor Fowler in South Kensington 
were provided by members of their staffs. 
