2 
PHYSICAL PLANT 
Laboratory, storage, and office space occupies three rooms in the 
National Museum of Natural History, Smithsonian Institution, Tenth and 
Constitution Avenue, Northwest, Washington, D.C. In addition, the Reg¬ 
istry has use of electron microscope, darkroom, and aquarium facilities 
Library and duplication services are also available. 
INFORMATION CONCERNING THIS REPORT 
This report is cumulative for all accessions in the Registry's 
collection as of 5 December 1973. It supersedes earlier reports in 
that most cases previously listed as pending now have diagnoses and 
some cases have been reinterpreted following additional study. As a 
new feature, pertinent references are given for those accessions that 
have been specifically described in the literature or that exemplify 
a type of disease that has been the subject of a series of papers. 
Additional information concerning selected unpublished cases 
can be made available on request. Persons interested in the compara¬ 
tive study of slides in the collection may either visit the Registry 
or request duplicate slides on short-term loan. Slides do not cir¬ 
culate from accessions that do not contain duplicate material; those 
that contain rare and irreplaceable material; and accessions that are 
being worked up for publication by the contributor. Anyone desiring 
to publish photographs from such comparative studies is expected to 
obtain permission from the contributor. Twenty sets of 20 slides each 
are available as instructional aides. 
This report is being distributed to all contributors whose 
address is still known and to other persons who have expressed an in¬ 
terest in the work of the Registry and/or tumors in lower animals. It 
is also being sent to selected persons known to be studying diseases 
in various cold-blooded vertebrates and invertebrates for their possi¬ 
ble interest in this peripheral field. Approximately 2,000 copies will 
be distributed. 
DISTRIBUTION OF SPECIMENS IN THE COLLECTION 
Specimens are accessioned individually except when groups of the 
same species having similar pertinent parameters (collecting site; 
type of disease; same experimental study, etc.) are received at the 
same time. We have been particularly fortunate that several collec¬ 
tions of research material have been contributed en masse: e.g., RTLA 
577 by Dr. William R. Duryee; RTLA 809 by Dr. Gladys S. King; and RTLA 
443 by Miss Leora Stark, Mr. Douglas A. Stark, and Dr« James C. Dahl 
for Dr. Mary B. Stark. 
As of 5 December 1973 there were 887 accessions in the collection 
distributed as follows: 
