444 BOTANICAL GAZETTE [ju 



Summarizing, we may say that so far as our materials show: 

 (a) there is a sensible differentiation between the two leaves of the 

 flowering stalk of Podophyllum in the number of lobes, but apparently 

 not in the variability of the lobes, at least not in their relative variabil- 

 ity; and (b) the correlation between the number of lobes on the two 

 leaves of the stalk lies somewhere in the neighborhood of .45, agreeing 

 well with the homotypic correlations for leaf characters in other 

 species. 



Carnegie Institution of Washington 



LITERATURE CITED 



1. Bailey, W. W., Bull. Torr. Bot. Club 13:111. 1886. 



2. Foerste, Aug., The May apple. Bull. Torr. Bot. Club 11:62-64. 1884. 



3. Holm, T., Podophyllum peltatum: a morphological study. Bot. Gazette 



Pub. 58 Carnegie 



27:419-433. 1899. 



4. Pearl, R., Variati 

 Inst. Wash. 1907. 



5. Pearson, K., and others. Mathematical contributions to the theory of evo- 

 lution. IX. On the principle of homotyposis and its relation to heredity, to 

 the variability of the individual, and to that of the race. Phil. Trans. Roy. 

 Soc. Lond. A. 197:285-379. 1901. 



* " — i On the fundamental conceptions of biology. Biometrika 1:320-344- 



1901. 



7. Penzig, O., Pflanzenteratologie. Genoa. 1890-94. 



8. Porter, T. C, Variation in Podophyllum peltatum. Bot. Gazette 2:117, 

 118. 1877. 



9. Trimble, W., Teratologic^ notes. Bull. Torr. Bot. Club 9:10. 1882. 



