94 



4. Prof. Werner acknowledges the difference between the ani- 

 mals reared up in yellow enviroument and those, reared up in 

 black-ground. But he asserts, that the darkness and Ihe dimi- 

 nished yellow colouring of the animals, reared in black envirou- 

 ment, is not caused by black colour but by hunger. He inferes 

 this from the smallness of these Salamandra, but if he had meäsured 

 them, he would have found that the ,,yellow" specimen, reared up 

 in yellow environement and represented in he figure is smaller than 

 the dark Salamandra, reared up in black enviroument, but after 

 Prof. Werner hypothesis it has to be darker and less yellow 

 coloured. 



Prof. Werner's hypothesis is also regarding the length of the 

 coresponding Salamandras mathematically disproved. 



5. It remains to correct my treatise in foUowing. I say that the 

 Salamandra-larvae are more yellow coloured then the mother; this 

 expression is not quite correct, because the young ones, reared up 

 in yellow environement, certainly show more yellow on the head and 

 the legs, and particularly owing to the union of the side-spots into 

 lines on the back, b jt the longitudinal spots did not unite into the 

 Strips, as in the case of the mother. 



6 At last, I have to mention the measurements of surfaces, 

 covered by the black and yellow colour of Salaman.lra-larvae, made 

 by Karl Pearson, Galton Professor of Eugenics, at the Univer- 

 sity of London, Biometrie Labaratory of the same University, wich 

 resulted in the foiowing numbers : |f} of the surface of mother was 

 covered by yellow, ||f by black colour; i| of the surface of Sala- 

 mandra-larva, represented in Fig 2, was covered by yellow and |-^ 

 by black; 2-V of the surface of the larva represented in Fig. 3 was 

 covered by yellow and || by black; -^^ of the larva, represented 

 in Fig. 4 was yellow, while |] black; and ^V P^rt of the surface of 

 the larva, represented m Fig. 5 was yellow while || black coloured. 

 I am very obliged to Professor Karl Pearson for his kind measurements 



m^ 



