QUARTERLY CHRONICLE. 39 



with cilia, which organs, on the other hand, are wanting- in 

 those of the largest as well as in those of the smallest size. 

 The occurrence of the ciliated investment in the young saccuU 

 suggests the question whether the cilia may not have some- 

 thing to do with their migration ? As yet we know nothing 

 Avith respect to the form under Avhich the parasite penetrates 

 into the muscular substance, whether in that of a sacculus, or 

 whether, as would apjiear probable from Hessling's observa- 

 tion, the saccular membrane be not developed secondarily 

 around an aggregation ofpsorospei'ms, or perhaps of the sphe- 

 rical cells, their parents, which had previously penetrated. 

 As regards the latter point, he has no facts to adduce, and in 

 support of the former has only a single observation to record. 

 In a sacculus of the smaller size, taken from the diaphragm 

 of a pig, one end of it appeared to be produced into a filament 

 about four times the length of the sacculus itself, and con- 

 tinued in a straight line with it, parallel to the long axis, and 

 through the otherwise untouched striated substance of the 

 fasciculus. But what was at first taken for a filament 

 turned out, upon closer inspection, to be merely a narrow 

 fissure in the muscular substance, which gradually widened 

 as it approached' the sacculus. The suggestion at once arose 

 whether this fissure might not represent the accidentally 

 remaining vestige of the passage of the sacculus. The expla- 

 nation, however, is given with reservation, as the appearance 

 in question was only observed once. 



Although the ; ithor has not been able to say anything 

 positive as to the ^vay in which the vesicles penetrate the mus - 

 cles, he thinks, considering their being so like the Trichina, 

 and also that they are generally found in the neighbourhood of 

 the stomach, that we may pretty safely conclude that it is 

 through some part of the alimentary canal that they first enter 

 the body. It is also certain that they are conveyed from here by 

 some means to difl'erent parts of the body ; why not by the 

 blood-vessels ? He has himself only observed one case which 

 in any wa,y would prove this ; a young sacculus was found 

 very close indeed to an artery in the diaphragm. Nothing 

 however can at present be positively stated until the whole 

 history of the development of the sacculi is known. 



7. "On the Structure of the Human Conjunctiva,'''' by Pro- 

 fessor Ludwig Stieda. — The author's observations, founded 

 upon sections in various directions of the conjunctival mu- 

 cous membrane, show that it presents numerous deeper or shal- 

 lower grooves or furrows, v.^iich pervade it in all directions, 

 and are lined with a cylindrical epithelium, whilst the inter- 

 mediate parts of the surface are covered with a scaly epithe. 



