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1st. That the white globules can open for themselves a 
passage through the uninjured walls of the vessels. 2nd. 
That the blood possesses a power of nutrition which permits 
it to rapidly close the orifice by which these globules passed 
out. In a second memoir Waller endeavoured to establish 
the identity of the corpuscles of mucus and of pus with the 
white globules of the blood. He did not regard the passage 
of the globules as necessarily a vital process, since he was 
able to observe it after death ; and he considered that the 
phenomenon might be due to a solvent action exercised by 
the blood globules on the vascular walls. These researches 
of Waller appeared in the ‘Philosophical Magazine’ and fell 
into profound oblivion, even in England, until the moment 
when Cohnheim published his work on the same subject in 
c Virchow’s Archiv.’ Dr. Balogh, wishing to check the ex- 
periments of Cohnheim, instituted, with the aid of Dr. 
Andreas Csabatamy, a great number of experiments on the 
mesentery of frogs, some poisoned by curare, others left 
intact. He noticed very readily the tendency of the white 
corpuscles to form agglomerations in the vessels at certain 
points ; but, although he made repeated observations, some- 
times for twenty-four hours, he quite failed to see even one 
white globule pass through the walls of the capillaries, or 
one that had so passed. Dr. Balogh, in the face of these 
negative results, asks what can have led Waller and Cohn- 
heim to admit that the white globules of the blood can pass 
through vascular walls; also, if pus-cells cannot be formed 
in the connective tissue without the participation of the white 
globules of the blood ; and, finally, if the white globules of 
the blood can be a source of the formation of pus. He con- 
siders the idea put forth by Waller and reproduced by Cohn- 
heim as the result of optical errors. He does not deny 
absolutely the existence of some apertures in the walls of 
the vessels, but he is convinced that they would be too small 
to allow the passage of the globules. He could not see them 
with a new immersion objective of Hartnack, giving a magni- 
fying power of 2,600 diameters ; and he doubts if such aper- 
tures existed whether penetrating injections could succeed iu 
the way they do. Besides, Keber, who described these pores, 
was unable to demonstrate them in a reunion of German 
naturalists and physicians, and the method of Recklinghausen 
(impregnation with silver) produces the appearance of orifices 
where nothing of the sort really exists. He considers the 
pus-cells seen outside the vessels to arise from the connective 
tissue ; and the cells of the vessel walls may equally give 
rise to such. The white globules of the blood accidentally 
