A RAT-BREEDER'S TRIUMPH 



A " Dutch-marked " cross between a black and a white rat bred by Mr. H. C. Brooke. It shows a probably 

 unique symmetry of markings. The black and white rats of the fancier are both derived from the common brown 

 rat (Raltai, narvegicus) and have nothing to do with the wild black rat (Rattus ratlus). 



B 



VARIATION IN THE MAGPIE MOTH 



This common moth. Abraxas grossulariata, which ranges 

 from Britain to Japan, and is famous for its extraordinary 

 number of variations in colour and markings. Such slight 

 differences as those between the type A and the variety B 

 (laclicoior) illustrate the minute variations which form part 

 of the raw material of evolution. 



