108 THE MOLECULAR ARCHITECTURE OF PLANT CELL WALLS 



TABLE V 



The inclination, in degrees to the longitudinal axis, of striations in filaments of 



Cladophora prolifera(fig. 38) 



A negative sign indicates a left-hand spiral, the absence of sign a right-hand spiral. 



a end of cell nearer tip of filament. 



b centre of cell. 



c end of cell farther from tip. 



Spaces left blank indicate that the striations are obscured. 



the chances of a complete change must wait until the very tips of the 

 filaments can be studied in an X-ray microcamera. The results are 

 nevertheless rather convincing (45). They may best be understood by 

 reference to Fig. 37. It must be remembered that the meridional arc of 

 5-4 A. spacing arises solely from the transverse set of chains, while the 

 corresponding equatorial arc corresponds to the longitudinal set. 



