19 6 2 M. H. F. WI LKI N S 



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* 1 



Fig. 1. One of the first X-ray diffraction photographs of DNA taken in our lab- 

 oratory. This may be compared with the later photograph in Fig. 10. (Photograph 

 with R. Gosling; DNA by R. Signer). 



that I touched the gel with a glass rod and removed the rod, a thin and al- 

 most invisible fibre of DNA was drawn out like a filament of spider's web. 

 The perfection and uniformity of the fibres suggested that the molecules in 

 them were regularly arranged. I immediately thought the fibres might be 

 excellent objects to study by X-ray diffraction analysis. I took them to Ray- 



s-33 



