( 998 ) 
From this series of experiments it may be concluded that a saturated 
camphor-solution in a 500-fold dilution still revives phagocytosis. 
5. SOME ADDITIONAL REMARKS. 
From a survey of the various experiments detailed above it appears 
that all substances, hitherto experimented upon which dissolve in fat 
or are soluble in fat, promote phagocytosis to a considerable extent. 
And we may add that this was also the case with chloral (1 to 
20.000 and weaker) and with turpentine (1:50.000), which latter 
result, it may be observed by the way, one will be inclined to connect 
with the power of turpentine to cause local exsudations, and also 
with the therapeutic inhalation of turpentine-vapour at tuberculous 
processes in the respiratory organs, and the stimulating effect of the 
smell of resin. 
The results we obtained with phagocytes show a remarkable 
correspondence with what J. Lorn, and afterwards R.S. Linum, have 
observed on the artificial parthenogenesis of eggs *). 
LorB discovered namely that substances dissolving fat have the power 
to render the parthenogenetic development of eggs possible. — 
How can this fact be explained? We may imagine with LorB 
that the substance dissolving the lipoid, weakens the egg membrane 
thus giving rise to the formation of a fertilizing membrane. We 
think we may safely go one step further, and assume that it is 
owing to the weakening of the membrane that the movement of the 
protoplasm, underlying the cell-division, manifests itself. This view 
is confirmed by the observation of R. 5. Laun ®), who saw that 
also by a short transitory raising of the temperature in eggs of star- 
fishes a typical fertilizing membrane may be formed, which formation 
is followed by the development of part of the eggs into larvae. 
J. LorB could confirm this as regards the jelly-fish. 
There is still more analogy between what has been observed about 
phagocytes and about eggs. If we allowed more concentrated solutions 
of Chloroform, Benzene, Camphor, ete. to act upon the phagocytes 
they caused a decrease in the phagocytosis; in the case of Camphor 
the cells were even destroyed. Well, Lors has found that a somewhat 
protracted action on eggs of fat-dissolving substances causes destruc- 
tion of these cells, so-called cytolysis. 
Consequently the favourable effect which the above-mentioned sub- 
1) Cf. ao. J Loes. Die kiinstliche Parthenogese. Handbuch der Biochemie des 
Menschen und der Tiere. Band | 1910. p.p. 101 en 102. 
2) R. S. Linus. Journal of Experim. Zoology 5, 1908. 375. (cited from Loes l.c.). 
