Some recent Studies on Variation and Correlation in Agri- 

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 Amer. Natural. Vol. XLV. New- York. 1911. 



Pearl, R. 58.11.57. 



Variation and Differentiation in Ceratophyllum. 

 Carnegie Inst. Publications N°. 58. S. 



Pearl, R. and Surface, F. M. 58.11.42 



Experiments in breeding Sweet Corn. Mc. 

 Agr. Expl. Stat. Ann. Rpt. p. 249—307. 1910. 

 Pearson, K. 58.11.51. 



On the sources of Apparent Polymorphism in Plants. 

 Biom. Vol. I, p. 304—306. April 1902. S. 

 Pearson, K. and Yule, G. U. 58.11.5:58.35.5. 



Variation in Rayflowers of Chrysanthemum leucanthemum, 

 1133 heads gathered at Keswick during July, '95. 

 Biom Vol. J, p. 319, April 1902. S. 



Pearson, K. (and others). 68.11.5. 



Cooperative Investigations on Plants. I. On Inheritance in 



the Shirley Poppy. 



Biom., Vol. II, p. 56-100, Nov. S. 



II Variation and Correlation in Lesser Celandine from Diverse 



Localities. 



Biom., Vol. II, p. 145—164 Febr. 1903. S. 



Perriraz, J. 58.11.5. 



Etude biologique et biometrique sur Narcissus angustifolius 



Curtis. 



Bull. Soc. Vaudoise Sc. nat. (5). Vol. XV N°. 165. 1902. 



Perriraz, J. 58.11.5. 



Etude biologique et biometrique de Primula vulgaris. 

 Bull. Soc. Vaudoise. Sc. Nat. (5j. Vol. XL1V N°. 164. 1908. 



