On the Structure and Development of the Cysticercus cellulosae, as Found in the Pig, by George Rainey

                                character, some were so completely filled with 
such particles even to the exclusion of all the 
blood corpuscles, as to be recognisable only as 
blood vessels, by their mode of ramification. 
Their tunics had become so attenuated 
as not to be visible under the microscope, 
& the mass of molecules within them pre=
sented the appearance of casts of their 
interior. In these vessels the coat ap=
peared to have been destroyed, & the molecu=
lar matter to have become extravasated 
among the muscular fibres. See Plate 3, 
fig: 4. which is the representation of a 
blood vessel 1/333 of an inch in diameter 
filled with organic molecules from the heart 
of a Pig very much infested with cysticerci. 
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 capil=
laries, especially when they contained blood corpuscles, so that I am not 
enabled to state that the presence of mole=
cules in these vessels in sufficient quan=
tity to admit of detection by the microscope 
is invariably practicable. However in all 
cases, the smaller blood vessels & capil=
laries 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