CHROMOSOME ABERRATIONS IN ANIMALS 707 



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Offermann, C. A. (1936) Branched chromosomes as symmetrical duplications. 

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Oliver, C. P. (1932) An analysis of the effect of varying the duration of X-ray treat- 

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Painter, T. S. (1933) A new method for the study of chromosome rearrangements 

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Papalashwili, G. (1935) The effect of a combined action of X-rays and low tempera- 

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Parker, D. R. (1948) Observations on crossing over induced by X-rays in the males 

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Pasteels, J., and L. Lison (1950) Recherches histophotometriques sur la teneur en 

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Paterson, E., and M. V. Thompson (1949) Effect of urethane combined with X-rays 

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Patterson, J. T. (1930) The production of mosaics in Drosophila by X-rays. Anat. 

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their linear dependence on dosages of irradiation. J. Genetics, 41: 195-215. 



