360 Harper: Native weeds and their probable origin 



Gilbert, E. G. A note on hybrids. Jour. Bot. 41 : 348-359- 1903. 

 (Refers to Rubus mostly.) Discussed by E. S. Marshall in the 

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Gray, Asa. The pertinacity and predominance of weeds. Am. Jour. 

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Halsted, B. D. American and English weeds compared. Plant World 



3 : 171-173. N 1900. 



King, Clarence. Catastrophism and evolution. Am. Nat. II: 449- 

 470. Au 1877. 



LeConte, Joseph. On critical periods in the history of the earth, 

 and their relation to evolution ; on the Quaternary as such a pe- 

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MacDougal, D. T. Heredity and environic forces. Science II. 27 : 

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Malinvaud, Ernest. The species and hybrids of 



Mentha. (Trans- 



lated from the French.) Jour. Bot. 38: 1 71-174. Ap 190c 

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 Rothrock, J. T. A nascent variety of Brunella vulgaris L. Contr. 

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Thoreau, H. D. The Maine woods. (Originally published in 1864. 

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Webber, H. J. Influence of environment in the origination of pla nt 

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The relation of phylogenesis to 1 istorical geology- 



White 



Science II. 22: 105-113. 28 Jl 



