Mendel's law of heeedtty and horttculture. 



45 



fourteen plants of wliicli flowered true albinos. In 1908 three true 

 albinos of the same parentage were raised by Mr. E. G. Thwaites, 

 also one by Sir Trevor Lawrence and one by Messrs. Veitch. 

 C. Schroederae aJha (fig. 34) x C. iutcDuedia alha, raised by Mr. 

 Cook SON, produced in 1907 the coloured liybrid C. x Thayeriana , 

 similar to the hybrid raised by Mr. Orpet between the typical G. inter- 

 media and C. Schroederae alha. C . Gashellicnia alha x C. Harrisoniana 

 alha (fig. 31), exhibited by Mr. Thwaites in 1908, produced the 

 coloured hybrid C. x Williamsiae, four plants of which had coloured 



Fig. 24. — Paphiopedilum x Maudiae. {Orchid Review.) (p. 44) 

 A pure R albino. 



flowers like the typical hybrid between C. Gaskelliana and C. Har- 

 risoniana. G. Gashelliana alha x G. Warneri alha (fig. 32), raised 

 by M. Peeters in 1904, produced the hybrid G. x Peetersiae Myra 

 (fig. 33), five of which were true albinos with pure white flowers and 

 green leaves, and two were coloured, having lilac-purple flowers with 

 purple margins to the leaves. 



These results are similar to those obtained in the Mendelian experi- 

 ments of Professor Bateson, Mr. E. C. Punnett, and Miss 

 Saunders with sweet peas and stocks. 



It is evident, therefore, that in orchids, as in sw^eet peas and stocks, 

 the appearance of sap-colour depends on the simultaneous presence of 

 two complementary colour factors, which may be termed C and K. 



