402 



INDEX AND GLOSSARY 



Meg'aspore (/xeyas, large : erTropa, a seed), 

 the female spore in plants with sexually 

 dimorphic spores, always distinguished 

 by its large size from the male or micro- 

 spore : Salvinia, 364 : Selaginella, 367 : 

 Gymnosperms, 372 : Angiosperms, 378 



Megazo'oid (jae'yas, large : uov, animal : 

 et6os, form), the larger zooid in unicel- 

 lular organisms with dimorphic zooids, 



35, 130 



Mer'istem (juepurr^a, formed from 

 jaept^io, to divide), indifferent tissue of 

 plants from which permanent tissues are 

 differentiated, 346 



Mes'entery (jae'cros, middle : eVrepoi/, in- 

 testine), a membrane connecting the en- 

 teric canal with the body-wall, 275 : de- 

 velopment of, 300 



Mes'oderm (/ueVo?, middle : 5e'p/u.a, skin), 

 the middle cell-layer of triploblastic 

 animals, n, 241 : Polygordius, 274 : de- 

 velopment of, 295 : splitting of to form 

 somatic and splanchnic layers, 298 



Mesoglce'a (/ueVo?, middle : y\oia, glue), 

 a transparent layer between the ecto- and 

 endo-derm of Ccelenterates : in Hydra, 

 223 : in Bougainvillea, 241 



Mes'ophyll (/aeVo?, middle : (f>v\\ov, a 

 leaf), the parenchyma of leaves, 348 



Mes'OStates (/o.eo-0?, middle : oTTJi'ai, to 

 stand), intermediate products formed 

 during metabolism (g.v.) and divisible 

 into (a) anabolic mesostates or ana- 

 states, products formed during the con- 

 version of food-materials into proto- 

 plasm : and (li) katabolic mesostates 

 or katastates, products formed during 

 the breaking down of protoplasm, 18 



Metab'Olism (/aera/SoAry, a change), the 

 entire series of processes connected with 

 the manufacture of protoplasm, and 

 divisible into () constructive meta- 

 bolism or anabolism, the processes by 

 which the substances taken as food are 

 converted into protoplasm, and (&) de- 



structive metabolism or katabolism, 



the processes by which the protoplasm 



i breaks down into simpler products, ex- 

 cretory or plastic, 17 



Met'amere OueYa, after : ju.e'pos, a part), a 

 body-segment in a transversely seg- 

 mented animal such as Polygordius, 267, 

 269 : development of, 297 : limited num- 

 ber and concrescence of in Crayfish, 

 310 



MetamorphOS'iS (/xeTa/xop^wcris), a trans- 

 formation applied to the striking change 

 of form undergone by certain organisms 

 in the course of development after the 

 commencement of free existence : Vor- 

 ticella, 131 : Polygordius, 302 



Mic'robe Campos, small : /St'os, life). See 

 Bacteria. 



MICROCOC'CUS (jal/cpo?, small : KOKKOS, 

 a berry) (Figure), 85 



Microgam'ete (^I/epos, small : ya/xew. to 

 marry), a male gamete (q.v.\ distin- 

 guished by its smaller size from the 

 female or megagamete, 130 



Micro-millimetre, the one-thousandth of 

 a millimetre, or i-25,oooth of an inch, 83 



Micro-organism. See Bacteria. 



Micropyle (/xt/cpo?, small : irv\ri, an en- 

 trance), 372 



Micro-sporan'gium (jul/cpo?, small : a-iropd. 

 a seed : ayyelov., a vessel), the male 

 sporangium in plants with sexually di- 

 morphic sporangia, usually distinguished 

 by its smaller size from the female or 

 mega-sporangium : Salvinia, 364 : Se- 

 laginella, 367 : Gymnosperms, 371 : An- 

 giosperms, 377 



Mic'rospore (julKpos, small : crnopd, a 

 seed), the male spore in plants with 

 sexually dimorphic spores, always dis- 

 tinguished by its small size from the 

 female or mega-spore : Salvinia, 364 : 

 Selaginella, 367 : Gymnosperms, 371 '. 

 Angiosperms, 377 



Microzo Oid (ju-Z/cpo?, small : giaov, an ani- 

 mal : eiSos, form), the smaller zooid in 

 unicellular organisms with dimorphic 

 zooids, 35, 130 



Midrib of leaf, Moss, 331 



Minimum temperature for amoeboid move- 

 ments, 21 



Mollusca, the, 305 



Moncec'iOUS (/j.oVo?, single : oucos, a 

 house), applied to organisms in which 

 the male and female organs occur in the 

 same individual, 197, 231 



Monopod'ial Guoi'os, single : TTOV'?, a foot), 

 applied to branching in which the main 

 axis continues to grow in a straight line 

 and sends off secondary axes to the 

 sides, 1^6 



MONOSTROMA OAO^OS, single : 

 anything spread out), 200 (Figure) 



MorphOl'ogy (/xop^, form : Aoyo?, a dis- 

 cussion), the department of biology 

 which treats of form and structure, 9 



Mor'ula (diminutive of indnnii, a mul- 

 berry). See Polyplast. 



MOSSES: Figures, 329, 334: general 

 characters, 328 : structure of stem, 330 : 

 leaf, 331 : rhizoids, 331 : terminal bud. 

 331 : reproduction, 332 : development 

 of sporogonium, 333 : of leafy plant, 

 335, 336 : alternation of generations, 

 336 : nutrition, 336, 337 



Mouth : Euglena, 47 : Paramoecium, 108 : 

 Hydra, 222 : Medusa, 239 : Polygordius. 

 267 : backward shifting of in Crayfish, 

 311 



MUCOR (uincor, mould) : Figure, 158: 

 occurrence and general characters, 156 : 



