738 
THE FROG PRESSURE FALLACY. 
Hydatis — The Hydatid. 
Found in the brain 
Found on the surface of the 
intestines, liver, lungs, &c. 
Found in the substance of 
these organs, in cavities, 
and between the muscles. 
Fasciola Hepatica — The liver fluke : — Found in the gall-bladder and its ducts. 
Hydatis caenurus cerebralis 
cysticercus vel tenui 
collis 
acephalocystis 
The many-headed hydatid 
The bladder-tailed or long- 
necked hydatid 
The headless hydatid 
Vermis — Worms. 
Tenia solium 
plicata 
Ascaris lumbricoides 
vermicularis 
The tape worm 
The folded tape worm 
The round worm 
The thread worm 
vermi-tricocephalus 
Strongylus gigas 
filaria 
The hair-headed worm 
The larger strongylus 
The smaller strongylus 
Acari Scabiei 
Pediculi 
Pulices 
Ricini 
ECTOZOA. 
Mange insect 
Lice 
Fleas 
Ticks 
The small intestines 
The caecum 
The jejunum and ileum 
The rectum, arteries, tu- 
mours, &c. 
The caecum and rectum 
The kidneys 
The bronchi, the eye, &c. 
I 
1 
The integument. 
[No apology was wanting from our friend Mr. Morton for endea- 
vouring to set us right with regard to the anatomy of the fasciola 
hepatica of the sheep. We have one common object — the 
discovery of truth. My cuts were copied from “Leeuwen- 
hoeck’s Micrographia,” the accuracy of whose delineations has 
rarely been disputed; and Mr. Powell and myself put this to 
the test by examining some dead flukes with one of his most 
powerful lenses. We have one of his best microscopes, and we 
will again have recourse to it when we can meet with some liv- 
ing flukes. The result probably will be, that there are different 
species of these parasites. The fluke of the rabbit and the sheep 
differ materially. — Y.] 
THE FROG PRESSURE FALLACY. 
By Mr. C. CLARK, V.S., Giltspur Street. 
Mr. Editor, — I n resuming the task of exposing College errors, 
I again disavow all personal motives. To vindicate the truths of 
physiological science, and enhance the honour of our profession, 
are objects great and noble in themselves; and when I find false 
doctrine perverting the first, and bad practice disgracing the latter, 
