ACANTHUS, ACARUS. 135 
By this exercise the student will acquire the habit of 
accurate investigation, and will become as well acquaint- 
ed with the science, as if he set down the righ€ name af - 
first. If we know a man by a wrong name for some 
time ; the memory is not at all embarrassed with the 
wrong name, after we are enabled to substitute the right 
one. Much pleasure and profit will be derived from a 
comparison of our own descriptions with those we may 
afterwards find in systematic works ; and we learn the 
application of terms by this methed better than by any 
other in use. ; 

‘3 
4—3. Acantuus. Spec. 1. 
spinus, (barley-bird,) head black, neck and back 
green, breast and throat greenish-yellow, belly 
white, tail yellow beneath. Small. Fringilla 
spinus of Lin. 
See MS. P. 
7—2. Acarus. Spec. about 100. 
americanus, (tick,) obovate, ruddy, scutella and 
_ joints of the legs white. A small insect on cat- 
tle and horses. 
-aphidioides, (red mite,) fore legs long ; abdomen 
terminating in two horns; colour red. Small. 
Tn decaying wood. 
vicinus, (dog-tick,) globe-ovate, livid, a round 
brown spot at the base. 
siro, (cheese-mite,) whitish ; head and thighs rust- 
colour ; abdomen bristly. 
seabiei, (itch-mite,) white ; legs reddish ; 4 hind 
ones with a long bristle. 
