Trans. Herts Nat. Hist. Soc, Vol. VIII, Plate VIII. 



..JjgP^^,, 



M 



UB 



K-OtT. 



.!s?Wa*ssB»nw"-*!sites2fcte ■ 



.«aKjefe!jaspitaS3ax6Er7.-:.-35iK»r-5T7 %j.jc ii w^i ..i 



Development of the Frog's Egg. 



