96 PREPARATION AND MOUNTING 
CHAPTER VIII. 
MISCELLANEOUS. 
Ir must be evident to all readers that there are various 
objects of interest to the microscopist which eannot be 
properly placed amongst any of the forementioned classes, 
but must not be omitted in such a guide as this professes 
to be. Of these may be mentioned the circulation of the 
blood in various animals, the rotary motion of the fluid 
in many plants, the best means of taking minute pho- 
tographs, &c. &e. 
Perhaps the most interesting of these objects is the eireu- 
lation of the blood through the finer vessels of various parts 
of animals used for these purposes, which parts, it is evident, 
must be very transparent to afford a perfect view of this 
phenomenon. The web of the frog’s foot is very frequently 
employed, but requires a certain arrangement, which we will 
now describe. A piece of thin wood (Dr. Carpenter reeom- 
mends cork) is taken, about eight inches long and three 
wide; about an inch from one end is cut a hole, half or 
three-quarters of an inch in diameter. The body of the 
frog is then placed in a wet bag, or wrapped in wet calico, 
whilst the hind foot projects; the whole is then laid upon 
the piece of wood, so that the foot, which is left free, may be 
extended over the hole. The web must then be spread out, 
and secured, either by loops of thread fastened to the toes 
and attached to small pins placed around the hole in the wood, 
or the pins may be inserted into the wood—through the 
web. A few bands of tape must be passed round the 
body, the leg, and the wood, to prevent any disarrangement 
arising from the struggles of the animal. Care must be 
