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10 BIOLOGY AND MEDICINE accumulation of data, the tilting chair, one meter arc, and collimating the crystal are also shown. LIQUID SCINTILLATION COUNTING (1958). 14 minutes, color. Produced by the Jam Handy Organization, Detroit, for the USAEC. For sale by Byron Motion Pictures, at $50.95 per print, including shipping case, F.O.B. Washington, D. C. Avail- able for loan (free) from USAEC headquarters and field librar- ies. Cleared for television. This film describes the use of a liquid scintillator for counting low- energy beta emitters commonly used in biological and medical tracer experiments. It also explains the advantages of the single- and double- photo multiplier tube liquid scintillation counters over the solid-phase and gas-phase counters, e.g., ease of sample preparation, high effi- ciency, and excellent sensitivity. The film describes counting tech- niques, how the counters work, and how a sample is prepared. Liquid scintillation counting is an extremely useful technique, particularly for weak beta emitters, such as 14 C and tritium, where the number of samples to be counted places a premium on the ease of sample preparation. MEDICAL RESEARCH REACTOR (1958). 22 minutes, color. Produced by Audio Productions, New York, for USAEC's Brook- haven National Laboratory. For sale from Byron Motion Pic- tures, at $70.95 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC head- quarters, field libraries, and Brookhaven National Laboratory, Upton, Long Island v N. Y. Cleared for television. Prepared primarily for those concerned with the design and utilization of reactors for medical research, this film demonstrates the need for such a reactor and defines the design criteria. The reactor and its components are shown during construction and assembly. Operation of the reactor and shutters controlling its neutron beams are shown by animation. There is also a neutron-capture therapy experiment se- quence at the Brookhaven graphite reactor which can be compared with the patient treatment facility at the new medical reactor. MODIFICATION OF RADIATION INJURY IN MICE (1958). 10 minutes, color. Produced by the Jam Handy Organization, Detroit, for the USAEC. For sale by Byron Motion Pictures, at $36.33 per print, including shipping case, F.O.B. Washington, D. C. Available for loan (free) from USAEC headquarters and field libraries. Cleared for television. This film shows the effects on mice of chemical protection by mer- captoethylguanidine (MEG) before irradiation and bone-marrow trans-