GLOSSARY. 263 



Mes'entery. [From the Gr. mesos, "middle," and enteron, the "intestine."] 

 A duplicature of the peritoneum covering the small intestine, which 

 occupies the middle or centre of abdominal cavity. 



Mes'oblast. [From the Gr. mesos, "middle," ;m<l hfastos, a "germ" or 

 " sprout."] The middle layer of the germinal membrane. 



Mesoco'lon. A duplicature of the peritoneum covering the colon. 



Metab'olism. [From the (Jr. -nirtabole, "change."] The changes taking 

 place in cells, whereby they become more complex and contain more 

 force, or less complex arid contain less force. The former is construc- 

 tive metabolism, or anabolism ; the latter, destructive metabolism, or 

 kat a holism. 



Metacar'pus. [From the Gr. meta, "after," and karpos, the "wrist."] The 

 part of the hand comprised between the wrist and fingers. 



Metatar'sus. [From the Gr. meta, "after," and torsos, the "instep."] That 

 part of the foot comprised between the instep and toes. 



Metre. [From the Gr. metron, a "measure."] The primary unit of the 

 Metric System. The measure of length from which the units of weight 

 and capacity are derived. It is equivalent to 39.37 inches. A milli- 

 metre is one-thousandth part of a metre. 



Mi'tral. Resembling a mitre. 



Mo'lar. [From tin*. Lat. /i/<>/<t, a "mill."] A term applied to the teeth which 

 l>niis<> or < i rind the food. 



Molec'ular. Pertain ing to molecules. 



Mol'ecule. [From the dim. of Lat. moles, a "mass."] The smallest quantity 

 into which the mass of any substance can physically he divided. A 

 molecule may be chemically separated into two or more atoms. 



Monox'ide. [From the Gr. monos, "single," and "oxide."] A compound 

 contain'mi; one atom only of oxygen combined with one of base, or 



metal 



Mo'tor Oc'uli. [Lat.] Mover of the eye. 



Moto'rial. Thai which causes movement. 



Mu'cin. The chief constituent of mucus. 



Mu'cOUS. A term applied to those tissues thai secrete munis. 



Myocar'dium. [ From the ( I r. //;//*, mi/s, a, " muscle," and kardia, the "heart."] 

 The iniisrii/iir structure of the heart. 



Myo'pia. [From the (Jr. myd, to "contract," and dps, the "eye."] Near- 

 sightedness. 



My'osin. Chief proteid substance of mn <!. 



Na'ris, pi. Na'res. [Lat.] A nostril. 



Neurilem'ma. [From the (Jr. MttttMlj a " nerve," and l<mnnt, a "coat" or 



"covering." | New-sheath. 

 Ni'trOgen. A colourless i;a,s forming nearly four lift hs of the at misphere : the 



.lilm-ii! of the oxyvvii in (he air. Literally, that \\hicli y /" rt< \ >u'tr<\ 

 Nucle'olus, ]>1. Nucle'oli. [Dim. of Lat. imcffns, a "kernel."] A smaller 



nucleus wit hin the nucleus. 

 Nu'cleus, pi. Nu'clei. [Lat. a "kernel."] A minute vesicle embedded in 



the cell protoplasm ( cyl opla.sm ). 



