312 E. 0. POLLAED. 



on cursory ooservation an appearance very similar to that of 

 Vertebrate taste-bulbs. 



Appearances, however, proved absolutely deceptive, for in 

 thinner sections examined with a higher power the nuclear- 

 like bodies (figs. 1 — 9, p.) were seen to be not nuclei, but each 

 in itself a minute cell parasite, evidently a stage in the life 

 history of a Sporozoon. 



Each of these parasites is elongate, tapering at each end, 

 and on an average only '01 mm. in length. 



The protoplasm presents a coarsely granular appearance 

 (figs. 8 and 9), the granules staining more deeply than the rest 

 of the cell protoplasm. 



Centrally there is a clearer space, and within this again a 

 deeply staining round body, which I at first took to be the 

 nucleus. 



After careful examination of my slides with Zeiss's homo- 

 geneous immersion lens I am, however, inclined to regard the 

 deeply stained body (fig. 9, n.) as the nucleolus, and the clearer 

 protoplasm {N.) in which it is situated as the nucleus. 



It is extremely difficult to make certain of this point in such 

 minute organisms, and I have not been able to absolutely 

 satisfy myself as to the presence of a nuclear membrane. 



Nevertheless the forms depicted in fig. 9 give one the im- 

 pression that the part marked N. is a large nucleus whose 

 chromatin is all collected into the globular nucleolus (n.), and 

 this appearance gains confirmation when compared with the 

 nucleus of other Sporozoa. 



Close to the nucleus in many of the specimens a clear round 

 structure may be observed {v. in fig. 9, b and c). This struc- 

 ture is refringent and well defined, but is not visible in every 

 specimen. It has the appearance either of a centrosome or 

 a vacuole. One would not, however, expect to find the former, 

 since there is no sign of nuclear division ; whilst if it be a 

 vacuole it is of great interest from the fact that, so far as I am 

 aware, such a structure has never been previously described in 

 a Sporozoon. 



The parasites, though occasionally seen at the distal ex- 



