30 INTRODUCTION TO THE EMBRYOLOGY OF THE LEOPARD FROG 



Stage Atl8°C. At25°C. 



Muscular movement 96 hrs 76 hrs. 



Heart beat 5 days 4 days 



Gill circulation 6 " 5 



Tail fin circulation 8 " 6V^ 



Internal gills, operculum 9 " IV2 



Operculum complete 12 " 10 



Metamorphosis 3 mos IVi mos. 



Those who wish to carry the tadpoles through to later development, 

 and even through metamorphosis into frogs, must begin to feed them 

 at about the time the external gills appear. The food consists of small 

 bits of green lettuce or spinach leaves, washed thoroughly and wilted 

 in warm water. The water in the finger bowls, or larger tanks, must be 

 cleaned frequently to remove debris and fecal matter and to prevent 

 bacterial growth. If the tadpoles are not crowded they will grow faster. 

 After about 10 days the numbers should be reduced to about 5 tad- 

 poles per finger bowl of 50 cc. of water. After metamorphosis, the 

 young frogs must be fed small living worms (Enchytrea) or forced-fed 

 small pieces of fresh liver or worms. 



