A Branch of the Lamar ckiana-Family. 263 



The whole number of mutants in the year 1895 

 amounted therefore to 614 or about 6 %, of which 0. 

 albida made up 2.5 %, O. lata 1.7 %, O. nanella 1.1 %, 

 O. oblonga 0.7 % and the rest altogether 0.1 %. I have 

 not calculated the percentages of mutants for the year 

 1896, in which 102 occurred. 



The figures show a very good agreement with those 

 which will be found in the table on page 224. There are 

 of course divergences of detail, as is only to be expected. 

 But similar divergences were also found between the 

 numbers produced by the 6 different plants. I have not 

 thought it worth while to give these here in detail ; suffice 

 it to say that the commoner mutants occurred in each of 

 the six sowings though in varying proportions. 



One of these six sowings gave a highly unexpected 

 and interesting result. It was the most extensive one ; 

 75 ccm. of seed was sown on 4 square meters of soil ; 

 that is to say as much per square meter as for the 5 other 

 plots. These seeds did not do at all well. In 1895 only 

 350 germinated that is 5 per cubic centimeter, whereas 

 usually 70 per cubic centimeter germinated.^ These 350 

 seeds gave rise to the number of mutants shown in col- 

 umn A. 



Number of mutants per 4 square meters. 



A B 



O. albida 64 95 



O. oblonga 9 30 



O. rubrinervis . . 1 



0. nanella 5S 



O. lata 61 54 



Totals 135 234 



^ A cubic centimeter contains about 500 seeds. 



