14 



PROBLEMS OF RELATIVE GROWTH 



abdomen of some female crabs (Shaw, 1928 ; Sasaki, 1928) ; 

 the chelae of many male and some female Decapoda (Huxley, 

 1927 ; Shaw, 1928 ; Tazelaar, 1930 ; Tucker, 1930 *) ; other 

 appendages of various Crustacea ; the trunk of Planarians as 



Fig. 5. — Increase of the logarithm of petiole-length against the logarithm 

 of lamina diameter in nasturtium leaves, Tropaeolum. 



against the head (Abeloos, 1928) ; the face as against the 

 cranium of dog and baboon (Huxley, 1927, analysing Becher, 

 1923 ; Huxley, unpublished, analysing Zuckerman, 1926) ; 

 the shoot as against the root of certain plants (Pearsall, 1927) ; 

 the size (facet-number) of the two lobes of the eye in the 



1 Tucker states that his data indicate a linear relation between male 

 chela length and breadth, and carapace length. However, his graphs 

 and his percentage measurements indicate that this does not give an 

 accurate fit, whereas logarithmic plotting (Fig. 55) gives an excellent 

 approximation to a combination of two straight-line curves, as in 

 male Uca. 



