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

                                by Schwann. For by the most careful 
examination of these organs both recent & 
after the application of acids, I have not been 
able to distinguish any thing which can be 
looked upon as a cell or cell nucleus cal=
culated to give the idea of their being de=
veloped from cells, or independence of cells 
according to the theory of that physiologist, 
but on the contrary all the various forms 
& characters which they present during 
the process of their formation simply in=
dicate the coalescence of very minute spherules 
of an homogeneous material, exceeding many 
times the number of a complete set of 
hooklets, into small globular masses, 
& these again into larger ones, & so on suc=
cessively, until a recognisable portion of a hooklet comes into view, which coal=
escing with other parts similarly formed, 
builds up as it were an entire organ.
It is worthy of remark that if these 
structures had been produced directly from 
the metamorphosis of previously existing cells, 
the circumstances connected with their for=
mation would have been the most favoura=
ble for observing both the original cells & 
the changes which they passed through; 
indeed, so much so, that it is almost im=
possible that they should have escaped notice. 
First, because these parts are of such a size 
& degree of transparency as to admit of 
examination with the highest powers of 
the microscope without the necessity of 
disarranging