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EXPLANATION OF PLATE SOL 



THE FROG IN ITS DIFFERENT STAGES. 



1. Just emerged from the egg, a tadpole, fishlike creature. 



2. Gills, in branching tufts, on each side. 



3. The blood is seen to course through the gill filaments. 



i. The gills begin to disappear, the eyes are formed, and the little tadpole 

 or pollywog begins to devour vegetable matter with voracity. 



5. Ceases to respire water and the hind legs begin to show themselves. 



6. The fore legs appear and the tail is being absorbed. 



7. It breathes by lungs, the tail has disappeared, and the legs are perfected. 



8. The full grown Frog, living upon insects, mice, birds, &c. 



GREAT WATER NEWT IN DIFFERENT STATES. 



May 6th. The young Salamander Tadpole or Newt just escaped from the egg- 

 May 18th. The fore feet have lengthened, and the eyes are perceived. 

 May 28th. The hind feet begin to appear, and the fore feet are well devel- 

 oped. 

 June 12th. The hind feet almost developed, and lungs extend half way 



down the trunk. 

 July 18th. It has arrived at the maturity of its tadpole state, and after the 



27th respires atmospheric air, having attained its perfect state. 

 9. The Great Water Newt depositing its eggs on the leaves of the smart- 

 weed, or amphibious knot-weed, (polygonum persicaria.) She is folding 

 the leaves over to protect the eggs. 



