Adresses, lettres ou télégrammes de félicita lions. 
sincères, ainsi que l’expression de son admiralion pour tout ce que 
vous avez fait en faveur du développenaent des études scientifiques 
pendant cette période d’un siècle et demi. 
Anders Donner, Robert Tigersted, 
Président. Secrétaire perpétuel. 
GRANDE-BRETAGNE. 
Société Royale, Londres. 
The President and Council of lhe Royal Society of London send 
greeting to the Académie royale de Belgique, and cordial congratu¬ 
lations on the attainment by the Académie royale of the Hundred and 
Fiftieth Anniversary of its foundation. The progress of science, to 
which for more than a century the Académie has conspicuously 
devoted itself, is a cause which hinds together the whole civilized 
World in common sympathy and effort. The international tie is, 
moreover, especially close between two neighbouring countries which 
hâve held their friendship, not only through prolonged prosperity, 
but also through years of dilïiculty and sacrifice, allies in act and 
thought, facing trials in common, and rejoicing together in final 
successful accomplishment. In the records, both of the Académie 
royale and the Royal Society, are historié names of which not a tew 
are mutual to the rolls of mernbership of both. Personal intercourse 
has slrengthened between the Académie and the Society the links of 
corporate colleagueship and coopération. 
We earnestly wish to the sister Académie ever continued succès. 
May the Académie flourish in its benefîcent labour of extending the 
bounds of knowledge and may it add, as in the past so also in the 
future, to collective knowledge of the process of nature, thus contri- 
buling to the intellectual and material progress of mankind. 
{s.) Gharles-S. Sherrington, {s.) Arthur Schuster, 
President. Foreign Seeretary. 
Burlington House, London, W. 1. 
May 1922. 
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