Although* 1 * 1 the stages in the lif<* cycle have been found 

 and the necessary ho? te are Vnovrn, yet the tiiae of the 

 appearance of eich tsta^e and it" duration is not Ikno'vn* 



In regions wh*ra th* re ia a definite winter or freezing 

 period, I believe, -tach ta^e ^ill bo found during a certain 

 season of th* year* In the Han >\ anoisoo bay region of 

 Califr.rnia where light fronts may sometimes ocnur, the 

 distribution of moh stage is hard tc< solve, For thif* 

 reason, California is net a ; : pod place to **orl' on this 

 particular part of the tsroblem of the life cycle, although 



* ^K^.t f im ** * A 4W% fc>^L I 1 y< 4 C. * 4 



very f.uvorabl^ in ev<?ry other repot 1 wtuld expect 

 and do find here oonsld*rabl* overlapping of the 

 taVin;.-' place* 



iring the raigra^ion of water birds in the np 

 fall reasons of the year, the igre'-.t /*jotity cf the 



-v re inubtless vnted in California ponds and atreams'i 



Although 



'some few duc^s wd ,;ee^e n-^rt in the bay x^egion of 



ilia, and thus eoaae ^ggn are pitiably vented in the 



time also, yt the great taajority of Uio duc^s aind 



^ 



vented into tho ponds *snd stroarji?-- dulling t>ie full rait; ration, 

 the eggs daubtl'aas r< r aaain practically dormant durin,-;, the 

 winter vasron. This conclusion ia reached bee; 

 tmp<5rAtur( of the water, altho 's^ldoe at the 

 point, yet is sufficiently low to >-Op the gena ballp in 

 the redia froa developing* Ibis conoluBion in borne out 

 by th<* ^or>^ cf -sw i (1917) in cc>nn"-tion wit>i tJie 



development cf the eggs cf 1 * y. r ;&^o n i^ue ^st^rtnannl. Korbert* 

 He mc^ns this statement concerning tti incubation p riod 



