requesting to inform the author whether the addressee knows that his paper has been accepted and to send addressee's new address if the latter has been changed.

Receipt of information on acceptance of the author's paper has been confirmed timely.

for the Congress authors.

regret for not being able to visit Warsaw in August because of family circumstances and the hope to meet at the Working Group session

The author has received a letter that is a part of a chain started in Japan. Its purpose is to allow scientists to express their support for the end of the arms race and a start of the nuclear disarmament. The author asks the addressee to write the similar letter to ten further scientists and to send a copy of the letter to Japanese Professor T.Ito. /On the reverse side A.Ershov wrote last names of ten scholars to whom he intended to write such letter./

The author tells on his future lecture at the Amsterdam Symposium on Algorithmic Languages and asks his addressees' advice on this subject.

Request to be a reviewer in the process of granting W.Turski the rank of ordinary professor.