The Orig'ui of Linaria Vulgaris Pcloria. 203 



accessible to investigation the mode of its appearance 

 and the external canses to which it is due. 



For these reasons I have endeavored to induce the 

 occurrence of the Pcloria from the ordinary form in my 

 experimental garden. It is obvious that the success of 

 such an experiment, at least at first, is dependent on 

 chance. This chance hov^ever can be favored by making 

 the cultures as extensive as possible, and by widely vari- 

 able conditions of life. Fortune has favored mc, and 

 after seven years' work my 

 object has been attained. 

 Th^Pcloria appeared quite 

 suddenly in the fifth and 

 sixth generation of my 

 culture. 



The signification of 

 my observations will be 

 more properly understood 

 if I premise my account 

 of them with a short gen- 

 eral and historical account 

 of the subject, referring 

 the reader for the litera- 

 ture to the following section (§21) and to Penzig's 

 Teratologic} 



Peloric flowers in Linaria vulgaris- were first dis- 

 covered, as is well known, in 1742 by Zioberg on an 

 island near Upsala and described by Linn.eus in the 



Fig. 38. A, B, Linaria vulgaris. 

 C, D, Peloric fli)\vers. 



^O. Penzig, PUanzcn-Teratologic, Vol. II, p. 195. 



^ The Pclorias have five spurs: Pcloria ncctaria. Rut there is 

 also a Pcloria ancctaria in which the tlowcrs are regular hut without 

 spurs. See Penzig, loc. cit., and Verlot, Production dcs varictcs, 

 p. 90. This variety is nearly sterile, setting very little seed, but it 

 breeds true. 



