Die Parasiten der Infectionskrankheiten. 41 
which Dr. Blair believed contained by chance some particles 
from the diseased liver cells that had floated into the duodenum 
and into the stomach with the bile. In April 1856, Dr. Blair 
wrote to his friend, Dr. John Davy, of London, as follows cer- 
ning his microscopical examination of that fancied and but ba- 
rely possible presence of debris of the liver: 
It (nitric acid, upon a certain specimen) enabled me to trace 
some of the tubules into the centre of the specimen; still more 
important, it enabled me to detect within them liver-cells, with 
their minute oil globules. ...... I think there can be little 
doubt that these tubules are the radical secreting ducts of the 
liver. May not these observations throw some light upon what I 
believe is still an undecided point in anatomy, viz., the precise 
manner in which the radicals originate in the lobules? To me, 
what I have seen seems a demonstration of the induction of Kier- 
nan on this point. 
Dr Blair was describing a substance that his patient 
had ejected with some bile or vomit, and this observation came 
near being buried with its author. It was not a demonstra- 
tion; nor would a thousand such observations have been a 
worthy basis for belief or assertion; but it has value as an ob- 
servation, that we mention this fact here, because it belongs to 
the record of a most important discovery and actual demonstra- 
tion or essential facts in the anatomy and pathology of the liver, 
and particulary because this curious observation by Dr. Blair 
shows how difficult and obscure was the kind of knowledge which 
he sought by the bed of the dying and in the corpse of dead of 
yellow fever. 
Endlich theilen wir. noch die Schlussbemerkungen des Herrn 
Dr. Harris mit. | 
X. Conclusions. 
The field in which the investigations have been commenced 
is too large to admit of final conclusions upon all the points of 
inquiry, in so brief a period, for analyzing the results of so nu- 
merous and varied an assemblage of facts. Our deductions, the- 
refore, must be regarded rather as landmarks and soundings, than 
as boundary lines, upon the shore of great truths. The conclu- 
sions that appear best established have important relations to 
practical questions in hygiene and to the interests of herd farmers. 
1) The nature and pathological effects of the disease in beef 
