THE GENOTYPICAL RESPONSE OF THE PLANT 
293 
of plants obtained as a result of these crosses is too small to be of any 
great value, two series of these crosses are tabulated here. Table 27 
shows the composition of the offspring from a cross between two in- 
dividuals belonging to the Falkenberg dune variety. Fig. 56 gives a 
picture of some of the one year old F,-plants from this cross. Table 
28 tabulates the individuals obtained from a cross between two plants 
belonging to the Kristineberg cliff form, and fig. 57 shows some of the 
Fig. 57. H. umbellatum. Fı-plants from a cross within the Kristineberg cliff type. 
young F,-plants. Fig. 58 illustrates a few F,-plants (the first row still 
in the rosette-stage) obtained by a cross within the prostrate dune va- 
riety from Vitemôülle. The distinctive characters of the cliff form 
(broad leaves, contracted growth) and of the dune forms (narrower 
leaves, slender growth) are clearly seen from the photographs. Fur- 
thermore, the results of the breeding experiments show sufficiently 
clearly that the characters typical of these varieties are hereditary and 
are not modifications due to the direct effect of the environment. 
In order to bring out the differences in the leaves between the 
