ECHINOCOCCUS ALTEICIPARIENS. 211 



be more unfavorable than that of the preceding species, although 

 its diagnosis is easier on account of the more rapid growth and 

 greater bulk of the swelling, the occurrence of the hydatid-buzzing 

 and the more distinct sensation of fluctuation. 



The structure of the walls of the mother-vesicle is the same in 

 both species, and is characterised by the numerous parallel con- 

 centric layers in the substance of the walls, which appear more 

 distinctly marked in the daughter-vesicles, and make their 

 appearance with remarkable clearness after treatment with caustic 

 potash with the addition of a drop of common red ink. 



Very recently (' Verhandl. der phys. med. Gesellsch. zu 

 Wiirzburg/ 1855, pp. 84 95) Virchow has proved that the 

 so-called alveolar colloid of recent authors, such as Buhl 

 (Rubener's illustrirte medicinische Zeitung, 2 Jahrg.) and 

 Zeller ( f Inaugural-abhandl. unter Luschka's Vorsitz/ Tubingen, 

 1854), is nothing but a number of emptied Echmococcus-\esicles. 

 This pathological product roust, therefore, by no means be con- 

 founded with cancer, as indeed Zeller proved ; but this disorder 

 must necessarily, I think, be regarded as the consequence 

 (Virchow) of Echinococci ; and it 'must not be supposed, as Zeller, 

 (who has given very good figures of the Echinococci) found, he 

 would have it, that we have to do here only with an accidental con- 

 currence of Echinococci. I refer the cases here treated of to 

 Echinococcus altricipariens s. hominisj and shall describe them 

 first after Zeller and then after Virchow. 



In Zeller's case the liver was studded throughout with hollow 

 spaces of various form and size, which were covered with a per- 

 fectly transparent, glassy, colourless, or slightly yellowish, gelati- 

 nous film. Larger cavities of this kind occurred, with others of the 

 size of a pea or a grain of millet, of which the smaller ones were 

 situated towards the periphery. But between the small alveoli 

 there were sinewy, granular, dull-white strise and partitions, which 

 were irregularly divided, but became more thickly deposited to- 

 wards the outside. The alveoli were roundish, elongated, irregu- 

 larly sinuated, communicating by larger or smaller openings with 

 the neighbouring cavities, and were coated on the smooth inner 

 surface, which was free from epithelium, with a crumbly mass, 

 which was sometimes softish and orange yellow, forming a round or 

 angular finely granular matter, soluble in acetic acid and potash, 

 entirely filling the cavities of the smaller vesicles which contained 

 oil-drops, gall-pigment, crystals of hsematoidine, phosphate of am- 



