MAR 
any thing with veins and clouds, so as to 
represent those of marble. ' 
Marbling of books or paper is performed 
thus; dissolve four ounces of gum arable 
into two quarts of fair water; then provide 
several colours mixed with water in pots or 
shells, and with pencils peculiar to each 
colour, sprinkle them by vvay of intermix- 
ture upon the gum water, which must be 
put into a trough, or some broad vessel; 
then with a stick curl them, or draw them 
out in streaks,' to as much variety as may be 
done. Having done this, hold your book, 
or books, close together, and only dip the 
edges in, on the top of the water and co- 
lours, very lightly ; which done, take them 
off, and the plain impression of the colours 
in mixturp will be upon the leaves ; doing 
as well the ends as the front of the book in 
the like manner, and afterwards glazing the 
colours. 
MARCGRAVIA, in botany, so called 
from George Marcgraaf, of Leibstadt, a 
genus of the Polyandria Monogynia class 
and order. Natural order of Putaminese. 
Capparides, Jussieu. Essential character : 
corolla one-petalled, calyptre-sliaped ; calyx 
six-leaved, imbricate ; berry many-celled, 
many-seeded. There is but one species, viz. 
M. umbellata, which is a native of the West 
Indies, in llie cool woody mountains. 
Browm says, it is frequent in the woods of 
Jamaica, appearing in such various forms 
that it has been mistaken for different 
plants in the different stages of its growth. 
MARCHANTIA, ip botarly, so named 
in honour of Nicholas Marchant, M. D. a 
genus of the Cryptogamia Hepaticae, Jus- 
sieu. Essential character : male, calyx 
salver shaped ; anthers numerous, imbedded 
in its disk : female, calyx peltate, flowering 
on the under side ; capsules opening at top ; 
seeds fixed to elastic fibres. Seven species 
are enumerated in the “ Systema Vegetabi- 
lium ;” of these five are natives of Britain. 
M. polymorpha is very common in wet 
places, on shady walks, and by the sides of 
wells and springs ; in figure it resembles an 
oak leaf ; the peduncles are in the angles 
of the lobes, from one to, three inches high ; 
capsules greenish, dividing into eight seg- 
ments; on the upper surface are glass- 
shaped conicri cups, on short pedicels, with 
a wide scalloped margin, inclosing four lit- 
tle bodies, very finely serrated at the edges. 
MARE. See Eqous. 
MARGARITARIA, in botany, a genus 
of the Dioecia Octandria class and order. 
Essential character-; male, calyx four- 
MAR 
toothed ; corolla four-petalled : female, ca- 
lyx and corolla as in the male ; styles four 
or five; berry cartilaginous, four or five 
grained. Ehere -is but one species, viz. 
M. nobilis, found in Surinam. 
MARICA, in botany, a genus of the 
Triandria Monogynia class and order. Na- 
tural order of Ensatm. Irides, Jussieu. 
Essential character: corolla six-parted, 
with three alternate segments, as small 
again as the others; stigma petal-form tri- 
fid, with the three divisions simple, acute ; 
capsule three-celled, inferior. There is but 
one species, viz. M. paludosa, a native of 
the moist meadows of Guiana. 
MARILA, in botany, a genus of the 
Polyandria Monogynia class and order. 
Essential character : calyx five-leaved ; co- 
rolla five-petalled ; capsule four-celled, ma- 
ny-seeded ; stigma simple. There is but 
one species, viz. M. racemosa, a native of 
the West Indies. 
MARINE, a general name for the navy 
of a kingdom or state ; as also the whole 
economy of naval aifairs, or whatever re- 
spects tlie building, rigging, arming, equip- 
ping, navigating, and fighting ships. It com- 
prehends likewise the government of naval 
armaments, and the state of all the persons 
employed tlierein, whether civil or military; 
Marine acid. See Muriatic acid. 
MAiUNE-c/mir, a machine invented for 
viewing the satellites of Jupiter at sea, and 
thereby determining the longitude of their 
eciipes. 
Marine remains, a term used to express 
the shells of sea-fishes, and parts of crusta- 
ceous and other sea-animals, found in dig- 
ging at great deptlis in the earth, or on the 
tops of high mountains. Being found in 
these situations, is an evident and unques- 
tionable proof o&the sea having been once 
there, since it must have covered tliose 
places where it has left its productions. It 
has been the general opinion, that these 
marine bodies were carried to the places 
where they are occasionally found by the 
waters of the universal deluge, described 
in tlie Old Testament. There are, however, 
evident proofs that it cannot have been the 
cause of all that is attributed to it, and 
there must have been sWe other cause of 
many of these remains having been placed 
where we now find them. 
Marine surveyor, is the name of a ma- 
chine, contrived by Mr. H. de Saumarez, 
for measuring the way of a ship at sea. 
The machine is in the form of the letter. Y, 
and is made of iron, or other metal. At; 
