1325 
violett”” nor in any other dye experimented upon in this respect. 
Only „Säure-fuchsin”, a dye which is no chloride and deviates con- 
siderably in composition from fuchsin showed something like it. It does 
not make any difference whether Säurefuchsin or Rubin S of GRÜBLER or 
Säurefuchsin S.M.P. of the Actien-Gesellschaft fiir Anilinfabrikation of 
Berlin is used for this purpose. I have never been able to state with 
certainty whether in a '/,,°/, Säure-fuchsin-solution being almost 
entirely decolored the color partly returns after the filtration of the 
carbon, But | have experienced, that in the almost decolored solu- 
tion after the filtration and even after the lapse of some weeks the 
color can suddenly and very intensely be reproduced by acetic acid. 
It must be taken in consideration in this case, that acetic acid 
stains likewise a diluted Säure-fuchsin-solution which has never been 
in contact with carbon, somewhat more deeply, but by far not so 
much as the solution almost decolored by carbon. 
1 desist from suggesting an hypothesis for the explanation of the 
last mentioned phenomenon, and only hope, that the nature of what 
1 have communicated here may, at some time or other, be explained 
and increase our knowledge of the theory of histological staining 
methods. 
Physiology. — “Phagocytes and respiratory centre.” 
Their behaviour when acted upon by oxygen, carbonic acid, 
and fat-dissolving substances. Explanation of the excitement- 
stage in narcosis.” *) By Prof. H. J. HAMBURGER. 
(Communicated in the meeting of March 27, 1915). 
Introduction. 
In a former paper it was shown that Iodoform, even in extremely 
slight quantities can accelerate phagocytosis, to a considerable extent’). 
We explained this action by assuming that this substance, after being 
dissolved in the lipoid surface, softens the cells, thus facilitating the 
amoeboid motion. 
If this view were correct, it might be expected that other substances 
which are soluble in lipoids, would act in the same way. This was 
indeed the case, without a single exception, with all the substances 
investigated, only not, as we found afterwards, with carbon sulphide. 
But in chloroform, chloralhydrate, ethylalcohol *), butyric acid, propionic 
acid*), benzole, turpentine, camphor, Peruvian balsam‘) (cinnamic 
1) A detailed account will appear in the Internationale Zeitschrift für physikalisch- 
-chemische Biologie. (ENGELMANN, Leipzig). 
2) H. J. HAmpureer, J. pe Haan and F. Busanovic, These Proceedings, March 25, 1911. 
5) H. J, HAMBURGER and J. pe Haan, Ibid, October 28, 1911. 
