Practical Considerations. 



145 



days. Subsequently examined, twenty-eight out of fifty-four eggs 

 had perished. 



Experiment 17. — Two egg-masses alternately immersed, drained, 

 and immersed again every two weeks, were placed in moist earth. 

 They commenced hatching two days afterward, and continued to 

 do so for twelve days. Upon subsequent examination, twenty-three 

 out of fifty-two had perished. 



Experiment 18. — Twenty egg-masses immersed from Dec. 26th, 

 1876, to Jan. 16th, 1877; then drained till Feb.' 6th; then immersed 

 till Feb. 27th; then drained again. On Feb. 3d, while dry, they 

 commenced hatching numerously, and a few continued for two days 

 to hatch while immersed. An examination March 7th, showed 

 about half of them still alive, the rest rotten. On March 27th they 

 were drained again, but none subsequently hatched — all having 

 rotted and dried up. 



Experiment 18a. — Two masses in same conditions as in Expt. 18 

 till Feb. 27th, were placed in moist earth and all the eggs hatched 

 March 7—12. 



Experiment 19. — Twenty egg-masses immersed from Dec. 26th, 

 1876, to Jan. 23d, 1877; then drained till Feb. 20th; then submerged 

 again. They commenced hatching on the 6th of Feb., and con- 

 tinued two days after the second submergence. On the 7th of 

 March but about five per cent, had rotted. On March 20th they 

 were drained again, but none subsequently hatched, except five 

 eggs from two pods at once placed in earth. 



Experiment 20. — Two egg-masses immersed for four weeks; then 

 drained for two weeks; then immersed for one week; then placed 

 in moist earth. They commenced hatching seven days afterward, 

 and continued to do so for six daj's. Subsequently examined, one 

 of the masses was rotten; the eggs in the other had all hatched. 



Experiment 21. — Twenty egg-masses kept from Dec. 26th, 1876, 

 in earth saturated with moisture. On Feb. 23d, 1877, they com- 

 menced hatching, and continued to do so till March 7th, when all 

 were found to have hatched, except one pod, which was rotten. 



Experiment 22. — Twenty egg-masses, alternately placed every 

 five days, from Dec. 26th, 1876, in earth saturated with moisture 

 and in earth which was very dry. Commenced hatching Feb. 14th, 

 and continued till March 7th, when, upon examination, all had 

 hatched, except nine of the pods, which were rotten. 



Experiment 23. — Twenty egg-masses immersed and exposed 

 10 



