XVI. 
ABSTRACT OF PROCEEDINGS. 
valves somewhat similar in construction to X-ray tubes. (4) Shock- 
proofing of tubes and apparatus in general was the next advance. 
Radiology can be divided into Diagnostic and Therapeutic, each a 
speciality on its own. In the early stages of diagnostic radiology with 
low-powered X-ray machines bones only were possible, owing to long 
exposures. Moving organs such as the heart and lungs were possible 
with more rapid exposures. Invisible organs were artificially outlined 
by means of contrast media, introduced either directly, such as by the 
mouth or rectum, or by ureteral catheter. In therapeutic radiology there 
was a tendency generally towards higher voltages — 400 to 600 K.V’s 
now being commonly used. Then came periods of low voltage therapy, 
Grenz ray and contact X-ray therapy. Results of X-ray therapy have 
gradually improved with improving methods of measuring dosages and 
by means of heavier filtration, but there is still room for some 
improvement in results. 
Abstract of Proceedings, 26th November, 1945. 
The Ordinary Monthly Meeting of the Society was held in the 
Geology Department of the University on Monday, 26th November, at 
8 p.m., with the President (Prof. H. J. Wilkinson) in the chair. About 
twenty-five members and friends were present. The minutes of the 
previous meeting were read and confirmed. 
A paper entitled “Contributions to the Queensland Flora, No. 9,” 
by C. T. White, was presented by Dr. D. A. Herbert. It included 
descriptions of new species and records of new localities of Queensland 
plants. 
Mr. Hines gave a short address on the pharmacological work of 
Thomas t Lane Bancroft, a former life member of the Society. He 
recalled that Bancroft planned to survey as widely as possible the 
pharmacological properties of the Queensland flora, and in a series 
of papers to this and other Societies recorded the more interesting of 
his discoveries. His work is still being followed up and has proved 
the starting point for a number of investigations of considerable interest 
and merit. At present, under the aegis of the C.S.I.R., his original 
plan for a pharmacological survey is being considerably extended. 
Miss E. N. Marks exhibited a collection of Queensland mosquitoes 
of which T. L. Bancroft had collected specimens. Of 48 described 
species of mosquitoes with type localities in Queensland, the type 
specimens of 25 were collected by Bancroft (specimens of 23 exhibited). 
In addition, he collected at least another 25 species (20 exhibited), 
many being the first records for Queensland. He collected also in 
New South Wales, Victoria, and Tasmania. 
