Fig. 1. — Shell of Mkraster corbovis. 



"A. W. Rowe, a physician of Margate, devoted his holidays to 

 collecting heart-urchins (Micrasters), from the Chalk of England, foot 

 by foot. He was able to show that what appeared to be a distinct 

 species found at the bottom of the Chalk gradually changed into 

 different species found at the top. This change is almost imper- 

 ceptible, but it can be traced in every part of the fossil shell, and 

 it takes place in the same way in all parts of the country. Here is 

 an example of evolution caught in the act. If we were to take a 

 set of photographs of these fossils from the base of the series to the 

 top, and copy them on a cinematograph film, we could see evolution 

 taking place before our eyes." — Dr. F. A. Bather {Creation by Evolu- 

 tion). 



"The members of one single genus of sea-urchins would have to 

 have been wiped out and replaced by barely distinguishable successors 

 some dozens of times during the course of the deposition of the English 

 chalk — if their fossils do not show descent each from a previous and 

 slightly different ancestor."— J. B. S. Haldane. 



There is in nature no inseparable dividing line between different 

 organic forms; for some forms there is such a gradual shading of one 

 into the other, that it is impossible to tell where one ends and the 

 other begins. Species are not primordial forms, fixed and impassable 

 from the beginning; they are in fact constantly changing and new 

 species or forms are constantly appearing. 



