a 



b 



m 



# 



e f 



Fig. 4. X-ray diffraction patterns from flagella. (a) Trout sperm flagella, 

 stretched by about 150% in moist air. X-ray diffraction diagram at 4 cm 

 specimen-to-film distance, (b) Perch sperm flagella, stretched by about 

 100% in moist air. Low-angle diagram at 6 cm specimen-to film distance. 

 (c) Trout spinal cord, stretched by about 80% in moist air. Diagram at 4 

 cm specimen-to-film distance, (d) Trout sperm flagella, prepared from salt 

 suspension, washed with ether and lightly stretched in moist air. Diagram 

 at 4 cm. (r) Trout sperm flagella. Film heated to 50°C for 5 min before 

 mounting. Unstretched. Diagram at 4 cm. (/) 1% acetic acid extract of 

 perch sperm flagella. Unstretched films. Diagram at 4 cm. 



198 



