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INTRODUCTION
Subscribers are now receiving the sixth full issue of the General Embryological
Information Service, in which all the data over the year 1955 are pubhshed.
We have tried to make this issue as complete as possible by extending our hst
of collaborators. New relations were opened with India, Australia and New
Zealand, and with several institutes in Japan. Contact was made with several
Universities in Latin America, while contact was re-established with Russia and
Czecho-Slovakia. We also tried to extend our relations with medical and veterinary
institutions where embryological work is done by some staff members
only. This action has led to an increase in the number of collaborators from
946 (1953) to 1095 (1955), and to an increase of the number of collaborating
institutes from 349 (1953) to 439 (1955).
The biennial collecting of data for the G.E.I. S. makes it more difficult to
keep our list of addresses uptodate. We therefore request all collaborators
to keep us informed about any change in address or position.
The preparation of the extensive manuscript of the Normal Table of Xenopus
laevis (see further under General questions and announcements on page
184) has heavily overloaded our staff this summer, resulting in a delay in the
preparation of the manuscript of the G.E.I. S. We offer all subscribers our apo-
logies for this delay in the appearance of this issue.
As mentioned in the 1953 issue, the subscription for the 1955 issue of the
G.E.I.S. will include the full issue 1955 and the supplement 1956. In the supplement
1956 new data for the "Supply and Demand Service for Laboratory
Animals" will be published, so that those interested are requested to send in
all available data before August 1st, 1956.
We should like to acknowledge our sincere thanks to those collaborators who
have helped us to open new relations with embryologists not previously
included.
P. D. NIEUWKOOP