Birefringence of Amœbæ

@article{Mitchison1950BirefringenceOA,
  title={Birefringence of Am{\oe}b{\ae}},
  author={J. M. Mitchison},
  journal={Nature},
  year={1950},
  volume={166},
  pages={313-314}
}
IT has been known for some time that the cell membrane of an amœba in water is birefringent. The optical axis lies radially, and the sign is positive with respect to the tangent1 (Fig. 1). I have found that if an Amœba proteus is fixed for about 10 min. in 4 per cent formalin and then immersed in a solution of potassium mercuric iodide of refractive index 1.56, the birefringence of the membrane decreases, and the sign becomes negative (Fig. 2). A similar increase in the negative birefringence… 
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