8 ANIMAL PARASITES. 



infested by Trichomonas, so as to obtain information as to their 

 capability of infection. According to this, the statements of 

 Donne, Dujardin (' Infusoires/ Paris, 1844, p. 299), Leblond, 

 ( f Trait e Zool. et Physiol, sur les vers intestinanx de Phomme'), 

 and Froriep ('Neue Notizen/ ii, p. 40), are correct. But those 

 of Von Gluge (' Untersuchungen/ Heft i, ciliated epithelium), 

 Valentin, Julius Vogel ('Pathol. Anat./ i, p. 104, and 'Erlau- 

 terungstafeln zur path. Anat.'), Von Siebold (AYagner's ' Hand- 

 worterb.uch der Phys./ ii, p. 6G0), Rokitansky ( : Pathol. Anat./ 

 3 Aufl., i, p. 367), Lebert (« Physiol. Pathol./ Paris, 1845, i, p. 

 230), Raspail ( f Nouv. Syst./ ii, p. 102, according to which the 

 animal is identical with Cercaria syrinus), and Ehrenberg and 

 Froriep (1. c, p. 88, by whom Trichomonas is referred to the 

 Ascarides), are to be corrected. 



"We have above referred to the slow movement of these 

 parasites. Movements of this kind, or the formation of pro- 

 minences, processes, &c, occurring in the lower sections of 

 the animal kingdom, are called amceboid movements. From 

 these we must distinguish the movements of individual micro- 

 scopic constituent parts of the human body, which we may 

 denominate pseudo-amceboid. Such movements are met with, 

 according to Lieberkulm (Tab. I, fig. 3), in the tenacious fluid 

 of dropsical ovaries, in the colourless blood-corpuscles of animals 

 and of man (Tab. I, fig. 4), for which reason they are met 

 with most frequently in leucaemia of the human subject, and 

 in the isolated cells of the human liver (Leuckart). All 

 these corpuscles with amasboid motion are diaphanous, homo- 

 geneous globules, which by slow movement give off all sorts of 

 processes, sometimes like tails. These last are not animals ; some 

 of them, perhaps, are lymph-corpuscles, consisting of Ecker's 

 contractile substance. The true Amcebce, according to Wagener 

 and Lieberkiihn, stand in a certain developmental connection with 

 Psorosperm\<e and Gregarince, of which we cannot speak here. 



2. Denticola hominis (Ficinus) ? 



Genus valde dubiosum (Tab. I, fig. 2'). 



In 1772, in his ' Arcana Naturae detecta/ p. 40, Leeuwenhoek 

 figured animalcules resembling Bacillarice, which he had discovered 



