350 CIRCULATING FLUIDS: 



Water. Solid constituents. Blood-corpuscles. Residue of serum. 

 Pigeon . 

 Trout . 

 Eelpout 

 Eel 



Land-tortoise 

 Frog 



[We have already alluded to the occurrence of animalcules 

 in human blood : in the blood of the lower animals such cases 

 are very frequently observed. 



Cercaria have been discovered in the blood by Mayer, and 

 in his ' Dissertatio de Organo Electrico et de Hsematorosis ; 

 Bonn. 1843/ he mentions the following : (1,) Paramoecium 

 loricatum s. costatum, in frogs ; (2,) Amoeba rotatoria in fishes. ^ 

 Polystoma-like animalcules were described by Schmitz as oc- 

 curring in the blood of the horse. (Dissertatio de Vermibus in 

 Sanguine. Berol. 1826.) 



Gruby and Delafond have described a pecuHar animalcule of 

 frequent occurrence in the blood of the dog, and numerous ob- 

 servers have noticed similar phenomena in the blood of the horse 

 and the ass.] 



77/ e Lymph. 



Our knowledge of the chemical characters of the lymph is 

 very deficient. It is described as a viscid yellow, greenish 

 yellow, and occasionally red fiuid, devoid of odour, possessing 

 a sKghtly saltish taste, an alkaline reaction, and containing from 

 3 to 5 '715 of solid constituents. The lymph of the human sub- 

 ject is described by Miiller, Wurtzer, and Nasse as clear and 

 of a yellow colour, while others assign to it the same tint, but 

 assert that it is opalescent. It coagulates in the course of 10 

 or 15 minutes into a clear, tremulous, colourless jelly, and de- 

 posits an arachnoidal coagulum of fibrin, which was previously 

 held in solution, as in the Hquor sanguinis, and is usually co- 

 lourless, although Tiedemann and Gmelin have observed it of 

 a reddish tint. The fluid left after coagulation is rather 

 thick, resembles almond oil in appearance, and under the mi- 

 croscope exhibits, even when perfectly clear, a number of colour- 



' Valentin (Miiller's Archiv, 1841, p. 436,) fi-equently detected this animalcule in 

 the blood of the salmon, and once met with it in the fluid of the cerebral ventricles. 



