68 



Dr. Verloren on the Comparative Influence of 



results. I will only give one of the results, showing the difference 

 in the quantity of loss between the days and the nights, which 

 was much greater during the nights than during the days, and 

 also greater in the males than in the females. 





Day. 



Night, 



Mean loss of the $ insect 



5-333 

 5-7G3 



12-925 

 9-969 



o 





The following table will also give the hours of the day in which 

 the insects have come out of the pupae, showing that the great 

 majority come out in the morning or before one o'clock in the 

 afternoon, contrasting strongly on this point with Acheront'ia 

 Atropos, which we have observed to come out always in the 

 evening : — 



Out of 94 specimens of Sphinx Ligustri, there have 



come out before 9 o'clock in the morning 19 specimens. 

 „ 10 



12 



»1 %» ^ 9' 



>> 



16 



>) 



10 



J) 



10 



afternoon 



15 



}> 



6 



>> 



9 



5> 



5 





1 



94 



Lastly, I will remark that M. Vilmorin made some observa- 

 tions before the French Academy of. Sciences on the 21st March, 

 1859, stating facts of the same kind in plants as I have described 

 in insects. It is sufficiently known that plants can be advanced 

 in their development by putting them in hot situations. But M. 

 ViLMORiN has remarked that there are plants in which that cannot 

 be done, and in which periodicity prevails over the influence of 

 temperature, and the development takes place only at the de- 

 termined time of the year specified for each species. Thus, of 

 corn and beet cultivated in the same hot-house with the straw- 

 berry, the stawberries were sixty to eighty days in advance of those 

 which were cultivated in the open air, but the corn and the beet 



