122 
IVIE. EAEsET ON THE STEHCTHEE DETELOP:kIENT OE THE 
cules of an organic character ; some were so completely filled with such particles as to be 
entirely deprived of blood-corpuscles, and to be recognizable as blood-vessels only by their 
mode of ramification. Their tunics had become so attenuated as not to be visible under 
the microscope, and the mass of molecules within them presented the appearance of casts 
of then' interior. In some of these vessels the coat appeared to have been destroyed, and 
the molecular matter to have become extravasated among the muscrdar fibres. See Plate 
XI. fig. 5, which is the representation of a blood-vessel -g-^rd of an inch in diameter, filled 
with organic molecules, from the heart of a pig verj" much infested with Cystkerci. 
Although, in the instance above mentioned, the quantity of organic molecules in the 
blood-vessels was so abundant as to be easily detected, yet I may observe that in most 
cases of Cysticerci I have not been able to find these molecules in the capillaries, espe- 
cially when they contained blood-corpuscles, so that I am not enabled to state that the 
presence of molecules in these vessels in sufficient quantity to admit of detection by the 
microscope is invariably demonstrable. However, in all cases the smaller blood-vessels 
and capillaries are in an abnormal condition, but whether this is wholly attributable to 
the irritation of the incipient entozoa, or to some other cause, is a point which I have 
not yet been able to ascertain. 
Their calibre is very irregular. Some are much distended with blood-corpuscles, and 
others have their coats so attenuated as not to be distinctly risible. This condition of the 
vessels is best seen in muscles so small as to allow of microscopic examination without 
the necessity of mechanically separating their fibres, as in the muscles moring the eye- 
ball, especially near the part where the muscular fibres are connected with the tendon. 
Although the presence of these abnormal particles of an ambiguous character in the 
interior of the primary fasciculi, and that of minute molecules in the blood-vessels and 
their capillaries, with the attenuation of their coats, may not fully answer the question 
proposed as to the precise manner in which the first forms of Cysticerci find their way 
into the muscular fibres, still I think these facts render it highly probable that such forms 
of the entozoa as are represented in Plate X. fig. 11, existed at first as those minute 
particles which I have described in the muscular fibres, and that these had found their 
way to the muscular fibres through the medium of the blood. 
Without urging any opinion as to the source whence these entozoa are derived, I may 
here state, that from certain data which I have collected, and which I ufill now briefly 
mention, I believe it possible to institute a coru’se of experiments Avhich might thi'ow 
some light upon this question. 
Through the kindness of Mr. Fishee, Inspector of Newgate Mailvet, and some other 
persons employed there as salesmen, I have been enabled to examine specimens of 
measly pork taken from at least fiifty different pigs. In one class of these specmiens I 
found scarcely any but adult Cysticerci, after examining, perhaps, fifty difierent pieces; I 
might, however, find one or two of the immatm'e ones, but these were always hi the last 
stage of the vermicular form. In others, a second class, I coidd find only the earliest 
stages of the Cysticerci, and none of the perfectly-formed ones. And in the third class 
