364 JDobcll, The „Autogamy" of Bodo lacertae. 



generation . . . führt meistens zur Zystenbildung." He does not ans wer 

 my objections. For if the „gametoid generation" forms the „auto- 

 gamy" cysts, how is it that they - - already possessing a chro- 

 midium — form it in the cyst? 



Further, he states that he knew of the existence of fungi in 

 the lizard's gut. I knew this, and have already given him credit 

 for it. 



Lastly, Dr. Prowazek states that he does not believe my 

 fig. 4 shows the same organisms as fig. 1 and 2. I am prepared 

 to stand by my statement that they are the same, because I have 

 repeatedly watched the whole process in the living organism. To 

 what flagellate does Dr. Prowazek imagine the cysts in fig. 1 

 belong? I can not imagine, because I am acquainted with the 

 cysts of all the flagellates which occur in the frog's gut. 

 For a long time I thought these cysts might belong to some Proto- 

 zoon living in the gut, but I have now proved that they belong to 

 a yeast. Certainly there can be no question of their being Bodo 

 cysts — for no Bodo occurs in frogs *). That the cysts which I 

 figured all belong to the same organisms can easily be confirmed 

 by anyone. There is certainly no justification for Dr. Pro wazek's 

 insinuation that I have discovered a case of heterogenesis — having 

 bred yeasts from Protozoa. His remarks in this respect are irre- 

 levant. 



The structures which Dr. Prowazek takes for blepharoplasts 

 in my figures are merely granules in the cytoplasm - - one or more 

 often appearing in Heidenhain preparations. 



I am glad, however, that Dr. Prowazek agrees with nie in 

 regarding chromidia with scepticism, and I heartily agree „dass echte 

 Chromidien nur in wenigen Protozoenzellen . . . und noch seltener 

 in Metazoenzellen auftreten". 



That cysts of Bodo do exist, I do not for a moment doubt. 

 If Dr. Pro wazek's observations are just — as he believes — I am 

 puzzled to know what he means by saying „Bezüglich der Deutung 

 der Zysten als Autogamiezysten kann man allerdings streiten und 

 sie event. als besondere Regulationszysten auffassen". We are 

 not concerned with an Interpretation. If he has seen an autogamy 

 which includes not only formation of „chromidia" but also 

 regulär nuclear divisions, fusions etc. — then it is a fact: if he 

 has not. then my objections are fully justified. 



Trinity College, Cambridge. February V.)W. 



1) The forms described as Bodo by Ehren berg are probably other flagellates. 

 Cf. ray paper on the Protozoa in frogs, Quart. Journ. Mio. 8ci., Feb. 1909. 



