84 



INTERNAL ORGANS. 



but in tracing them before they were laid in the egg- 

 organ of the mother ( 1 ). 



M. Ehrenberg was no doubt assisted in this by the 

 circumstance, which generally holds good, of the eggs 

 of insects and small animals, being proportionably 

 much larger, compared with the mother, than in birds. 



From this circumstance, the eggs of insects may, 

 in many cases, with a little care, be traced in the 

 egg-organ of the mother, as has been done by M. 

 Straus-Durckheim in the cockchafer, and by Swam- 

 merdam in a much smaller insect the louse. 



Egg organ in the louse magnified; a, the right branch con- 

 verging; b, the left branch diverging ; c, an egg in the egg tube 

 ready to be excluded; d, d, the fountain which furnishes the 

 glue. 



Male reproductive organs in the blister beetle. 



(l) in Latin, Ovarium. 



