282 BIBLIOGRAPHY 



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 reference 

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431. 1872. Hoffmann, H., 'Ueber Variation,' Bot. Ztg., Leipzig, 



1872, xxx, pp. 529-539. 



The causes of variation in flower-colour are dealt with. 

 The effects of chemical substances, temperature, light, 

 water and cross-fertilisation on variation are discussed. 

 Also the fixing of varieties. 



432. 1874. Hoffmann, H., 'Ueber Papaver Rhoeas, L.,' Bot. Ztg., 



Leipzig, 1874, xxxn, pp. 257-269. 



An account of the variations noted in cultures of 

 Papaver. 



433. Hoffmann, H., 'Zur Kenntniss der Gartenbohnen,' Bot. 

 Ztg., Leipzig, 1874, xxxn, pp. 273-283, 289-302. 



Variation in flower- and seed-colour in cultures of beans. 



434. 1875. Hoffmann, H., 'Culturversuche,' Bot. Ztg., Leipzig, 



1875, xxxiii, pp. 601-605, 617-628. 



Variation in flower-colour in cultures of species of 

 Clarkia, Collinsia, Datura, Gilia, Godetia, GypsophyUa. 

 Hydrangea, Myosotis and others. 



435. 1876. Hoffmann, H., 'Culturversuche,' Bot. Ztg., Leipzig, 



1876, xxxiv, pp. 545-552, 561-572. 



Variation in flower-culture colour in cultures of Althaea 

 rosea, Cheiranthus Cheiri, and species of Linum, Lychnis 

 and Primula. 



436. 1877. Hoffmann, H., 'Culturversuche,' Bot. Ztg., Leipzig, 



1877, xxxv, pp. 265-279, 281-295, 297-305. 

 Experiments on the effect of darkness, mechanical 



bending, temperature, chemical substances, etc., on 

 variation in Papaver. 



437. 1878. Hoffmann, H., 'Culturversuche,' Bot. Ztg., Leipzig, 



1878, xxxvi, pp. 273-286, 289-299. 



Variation in flower-colour in cultures of Atropa Bella- 

 donna and fruits of Prunus Avium. 



438. 1879. Hoffmann, H., 'Culturversuche,' Bot. Ztg., Leipzig, 



1879, xxxvii, pp. 177-187, 193-207, 569-576, 585-595, 

 601-604. 



Variations in flower-colour in cultures of AnagaU/s 

 coerulea, Papaver and others. 



439. 1881. Focke, W. 0., Die Pflanzen-mischlinge, Berlin, 1881. 



Very complete account of hybridisation among 

 Phanerogams. 



440. Hoffmann, H., 'Culturversuche iiber Variationen,' 

 Bol. Ztg., Leipzig, 1881, xxxix, pp. 105-110, 121-125, 

 137-143. 



Variation in flower-colour in cultures of Anthyllis 

 Vulneraria and Glaucium luteum. 



