MICROSCLERUM 



r65 



MICROSPORON 



Microsclerum (nii-kro-skW -rutii) \uiKpoc, small ; ck/a- 

 poc, hard : //., MicroscUra\. Same as Alicrosclere. 



Microscope (mi' -kr<r-skop) [uinpoc, small ; gkoxeiv, to 

 view]. An optic apparatus for giving an enlarged 

 and distinct image of a minute and near object. M., 

 Achromatic, one in which, by proper lenses, the 

 chromatic aberration is corrected. M., Achromatic 

 Triplet, a simple achromatic microscope consisting of 

 one crown-glass and two flint-glass lenses cemented 

 together. M., Binocular, a microscope having 

 divergent oculars, one for each eye, so that the object is 

 seen with both eyes. M., Compound, one that con- 

 sists of two or more lenses or lens-systems, of which 



Eye-piece. 



Draw-tube. 



Fine Adjustment. 

 Body-tube. 



Aperture in 

 diaphragm. 



I 



Principal Parts of the Microscope. 

 (Half natural size.) 



the objective, placed near the object, gives an 

 enlarged and inverted real image. The other, the 

 lar, acting like a simple microscope, gives an 

 ed virtual image of the real image. M., Erect- 

 one in which the image is made erect by means of 

 prism placed above the objective. M., Oil-immer- 

 sion, a compound microscope of which the free sur- 

 face of the objective is immersed in a drop of oil placed 

 on the cover-glass. M., Polarizing, one with a polariz- 



"i-uiar, 

 Drisn 



ing-prism attached. M., Simple, one consisting of 

 one or more lenses or lens-systems acting as a single 

 lens. The rays of light that enter the eye of the ob- 

 server, after refraction through these lenses, proceed 

 directly from the object itself. M., Tripod Magnifier, 

 a simple microscope mounted in a frame supported by 

 three legs. M., Water-immersion, one similar to 

 the oil -immersion microscope, except that a drop of 

 water is used instead of oil. 



Microscopic (tni-kro-skop' -ik) \jiiKp6c, small ; cuo-eh-, 

 to view J. Pertaining to the microscope ; so small as to 

 be invisible except with the aid of a microscope. M. 

 Slide, M. Slip. See Cover-glass. 



Microscopist (tni-kros' '-ko-pist) [jiiKpoc, small; ohmtkp, 

 to view]. One who is skilled or expert in the use of 

 the microscope. 



Microscopy (tni-kros' '-ko-pe) [fiutpoc, small ; ono—eiv, 

 to view]. The use of the microscope; microscopic 

 study or observation. 



Microseme (tni'-kro-sim) \jiiKpoc, small ; ofjua, sign, 

 index]. Having a low index. See Index. 



Microsiphonula (mi-kro-si-fon' '-u-laA) \jiuip6c, small ; 

 oiyov, a tube, pipe: //., MicrosipAonulce\. In biol- 

 ogy, a larval stage of certain cephalopods. 



Microskopirlack (mi-kro-sko-per'-lak) [Ger.\ See 

 Mounting-media. 



Microsoma (mi - kro - so* - maK) [pnnpoc, small; cioua, 

 body : //., Microsomata~\. In biology, small chroma- 

 tin-granules in the cell-nuclei ; aggregated they form 

 the " merits'" of Bcehm, and the "ancestral germ- 

 plasms " or " ids " of Weismann. 



Microsomatia (mi-kro-so-tna' -sAe-ah). Synonym of 

 Microsoma. 



Microsomia (rni-kro-so'-me-aK) \junp6c, small; auun, 

 body]. An arrest of growth resulting in a dwarfing 

 of the whole body. 



Microspectroscope (mi - kro - spek' - tro • skof) [uixpoc, 

 small; spectrum, spectrum; OKOireiv, to view]. A 

 direct-vision spectroscope-prism in connection with the 

 ocular of a microscope, by the use of which it is possible 

 to examine the absorption-bands of a substance in 

 minute quantities. The usual arrangement is a series 

 of glass prisms in a small tube which is attached above 

 the ocular. 



MicTosphyctous(mi-Aro-s/i& / -tus)[utKp6c, small; aoi^tc, 

 pulse]. Having a small pulse. 



Microsphyxia (mi-kro-sfiks' -e-aK)\jtiKpoc, small ; anpi^ic, 

 pulse]. Weakness or small ness of the pulse. 



Microsplanchnus (mi-kro-splangk' -nus) [tunpoc, small ; 

 a- '/Ayxvov, viscusj. Having small viscera. 



Microsporangium (tni-kro-spo-ran' -je-um) [fitxpoc, 

 small ; a~6poc, seed ; ayyeiov, vessel : pi. , Microspor- 

 angia~\. In biology, a sporangium that produces micro- 

 spores. 



Microspore {mi'-kro-spor) [uiKpoc, small ; <rropoc, a 

 seed]. In biology: (a) an asexually-produced spore 

 of relatively small size, as in the RAizocarpa, Selagin- 

 elhz, Isoetce ; (b) One form of anisospore among the 

 colonial Radiolarians. 



Microsporidia (mi-kro-spo-rid' '-e-aA) [jiiKpoc, small ; 

 a~6poc, seed]. A genus of sporidia, a class of the 

 sporozoa. They occur as parasites in the muscles of 

 the frog, the marsh-tortoise, in worms and insects. In 

 silkworms they are held by some to be the cause of 

 Pebrine, q.v. 



Microsporon (mi-kro-spo f -ron) [junpdc, small ; OTzopoc, 

 seed]. A fungus to which several diseases of the 

 skin and hair are believed to be due. M. audouini, 

 the cause of Pelade, a disease of the hair-covered skin. 

 M. furfur. See Tinea versicolor. M. malassezii, 

 the specific fungus of pityriasis versicolor. M. men- 

 tagrophytes, the cause of mentagra, q. v. M. mi- 





