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THE AMERICAN NATURALIST [Vol. XL 



ere taken ]ust prior to oviposition on Jul 

 ere placed in solutions of various densities a 

 the following table with the results noted :- 



A glance at the above table shows that tlic aiiioum of salinity 

 from fresh water up to 1.010 had no effect whatever on the time 

 of hatching; all hatched out together 14 days al'ter fcrtihzation. 

 The 1.015 and 1.020 cultures were kept under exactly tlie same 

 conditions but neither developed to the point of hatching. In the 

 former considerable development took place, to the extent that the 

 main structures 'of the larva were outlined, but in the latter no 

 indications of deve]o|)ment could be observed except some cases ; 



No diU'erences could, be noted l)etween the larv;e hatched in 

 1.010 and those hatched in weaker solutions or fresh water and 

 later experiments proved them to be equally hardy. 



The young larvae were now transferred to solutions differing 

 from those in which they had been hatched, in order to test their 

 resistance to density changes at this ix^-iod. Tlu> results tally 

 remarkably with those on the okier nymphs and with the hatching 

 exjH'nments. Larviv liatelied in l.OlO, 1 .007.", and 1 .00.1 solutions 



