SECRETARY’S REPORT 127 
Dr. Franz Schrader and Dr. Sally Hughes Schrader returned to 
continue their cytological studies. 
Dr. Frank A. Hartman and Robert Albertin, of the Department 
of Physiology of the Ohio State University, spent some time on the 
island, and used the laboratory as their base for excursions up the 
Chagres River Basin and into the Volcan region of Chiriqui Province. 
They studied in great detail the anatomy of the adrenals in sloths 
and the coati-mundi while on the island. The adrenals of more 
than 600 vertebrates were collected during expeditions in the Republic 
of Panama. Field studies were made of selected cases, and the rest 
of the material was taken to the island for further treatment in prep- 
aration for cytological examination later at their University labora- 
tory. The skins of the birds obtained by them were donated to the 
United States National Museum. The hearts of a number of the 
vertebrates were sent to Dr. Struthers, of the University of Syracuse, 
for anatomical study of the coronaries and other blood vessels. 
Dr. Hartman plans to return for a much more extensive survey, 
especially in relation to the effects of the male hormone, particularly 
in the sloth. The use of the island as a base for excursions to other 
nearby regions emphasizes one of the unique features of the Canal 
Zone Biological Area. 
Dr. Per F. Scholander and Dr. Vladimir Walters, of the Arctic 
Research Laboratory at Point Barrow, Alaska, spent considerable 
time on the island studying the metabolic reactions to temperature 
in various animals and plants in order to obtain a tropical counterpart 
for the work done on Arctic forms in Alaska. A deep-freeze was 
used in some of their work, and the analysis of the tropical mammals 
and birds in cold gave just the information needed to interpret 
properly the findings in the Arctic. The work on the island with 
the deep-freeze proved of basic importance for formulating a theory 
on the relation between insulation and metabolism. 
R. Joseph Kowal, in charge of the laboratory of the Bureau of 
Entomology and Plant Quarantine at Gulfport, Miss., returned in 
order to reexamine and evaluate the special series of termite-resistance 
tests initiated by him 5 years ago, including the very valuable series 
of soil poisons. He was assisted by Russell EK. Fontaine, in charge 
of the insect- and pest-control work of the United States Army in 
the Caribbean area. 
Dr. Walter Clark, in charge of the Research Laboratory of Eastman 
Kodak, who had come to inaugurate the large air-conditioned labora- 
tory in the outskirts of Panama City, accompanied by Dr. Cleve C. 
Soper, in charge of Eastman Kodak’s tropical research work here, 
spent several weeks on the island in connection with their corrosion 
and deterioration studies. Asin past years, Dr. Clark took thousands 
