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taken for the nucleus of a cell, or for what physiologists would call 

 a nucleated cell ; and thus there is nothing which indicates that 

 these organs have been formed by transformation of previously ex- 

 isting cells, but, on the contrary, there is every appearance that 

 their formation is due to the simple coalescence of homogeneous 

 molecules. 



Up to the present point, the facts which I have stated are so 

 obvious, that their accuracy will, I think, not be questioned ; also 

 the interpretation of them is not only that which appears to 

 me the most natural, but is almost self-evident. There remain, 

 however, some considerations of a more theoretical kind, though 

 not of less importance. It will be asked, how the entozoon, in its 

 earliest condition, such as I have described it, finds access to the 

 interior of a primary fasciculus. Before attempting to answer this 

 question, I must observe that my description commences from a 

 condition of this entozoon so complete, that no one, on examining 

 it in this state with the microscope, will deny its perfect similarity 

 to those of the higher form. But there are other links in the chain 

 which I must now consider, and which so far have been omitted 

 only because I wished to keep that which is certain distinct from 

 that which is probable. Before the cells and molecules already 

 described accumulate in sufficient quantity to present the un- 

 doubted character above mentioned, they are found aggregated in 

 smaller groups, and even occurring individually in all the primary 

 fasciculi of the diseased muscle ; their quantity, and the size and 

 form of these groups, present the greatest possible irregularity in 

 the different fasciculi. In some the molecular deposit looks like an 

 early stage of fatty degeneration, but it has characters very different ; 

 one is the shape of the molecules, which resemble in all respects 

 those in the growing ends of an entozoon ; and another is, their 

 situation, which seems to be between the primary fibrillse, tending 

 to separate them longitudinally; however that may be, it is an 

 abnormal condition, and always co-existent with the higher forms 

 of the cysticercus ; and as the entozoon, as I have first described it, 

 could not possibly have taken on that form all at once, these groups 

 of molecules must therefore be looked upon as its antecedent 

 stage, or as portions of cysticerci in progress of development. But 

 I also find in the specimens of muscle infested with these entozoa, 



