BOTANICAL TERMS. 69 
Mees when used to exprefs the size of any particularparts: 
» of plants, are generally exprefsed by mentioning the pro« 
portion which those parts bear to other parts, but some- 
times reference is made to certain standards of measure» as 
A Hairs-BREADTH, a 12th part of a line. . 
A Linx (linea) the 12th part of an inch, orthe breadth 
of the white at the root of the nail of the middle finger, 
———— A Natu (unguis) about 2 an inch. 
Aw Iwncu (pollex) the breadth of the broadest part 
of the thumb. 
A Hanps-sreapta (palmus) about 3 inches, or 
the breadth of the four fingers. 
A Span (spithama) the space between the end of the 
thumb and the fore-finger, when extended; about 7 inches. 
Patm(dodrans) the space between theend of: thethumb 
and the end of the little finger, when fully extended; about 
Qinches. This is nearly the palm of foreign arene and 
is something more than a quarter of the English yard 
A Foor (pes) from. den cctee eaedek dovaikcostc, the 
lower joint of the thumb; or from the inner bend of the 
"arm, to the second joint of the thumb; about 12 inches. © 
A Cvusrrt (cubitus) from the outer bend of the elbow 
to the end of the middle finger; about 18 inches, or half 
an English yard. 
Aw Arm (brachium) from the armpit to the base of 
the middle finger; about 24 inches, or two feet. 
A Faruom (orgya) about 6 feet, or the space be- 
tween the ends of the Abgers:when theesma are- meboth 
widely stretched outs 
Mepvutta, pith. — 
MEMBRAN — {membranaceus thin, skinny, and semi- 
transparent, like chment 
Seuas whén the edges. of the stem are 
bordered with a thin leafy substance, as in rom —— 
and Broad-Leaved Pease Everlasting. 
MeENSURA, measure. 
- Mrp-rrp, the principal nerve which runs from the “we towards 
ie ain leaf, along its middle. 
MONADELPHIA, united threads or filaments; the name of a clafs 
in the Linnzan System ; see the introduction to that clats. 
Monanprta, one Stamen; ‘the naine of the: first intel in ‘the 
Linnzan System. « 
Mownorctra, one house; the name of the. Qist daa’ in ‘the 
Linnzan System. In the plants of this Clafs the Stamens 
and Pistils are in different flowers, but on the same plant. _ 
These plants are now distributed among the other Clafses, 
according to the number of their Stamens. 
Monoeywta, one Pistil in each flower, ‘This circumstance 
“© characterizes an Order in several of the Clafses, 
