INDEX AND GLOSSARY 



OF TERMS USED IN THE MICROSCOPIC SCIENCES. 



The figures refer to the page. 



Aberration, 22 (Lat. ab, from, and erro, to wander). Errors 

 resulting from imperfection of lenses. 



Aberrant. Differing from customary structure. 



Abnormal (Lat. ab, and norma, a rule). Contrary to usual 

 structure. 



Abiogenesis, 125 (Gr. a, privative ; bios, life; and gennao, to 

 produce). Spontaneous generation, or production without pre- 

 existing life. 



Absorption Bands, 18, 45, 101. Lines, more or less distinct, 

 produced in the spectrum by certain transparent substances. 



Abranchiate (Gr. a, without ; bragchia, gills). 



Acalephs, 166 (Gr. akalephe, a nettle). Sea nettles, or jelly- 

 fish. Their power of stinging is caused by microscopic thread- 

 cells in the integument. 



Acanthocephali, 335 (Gr. akantha, a spine, and kephale, a 

 head). An order of parasitic worms. 



Acanthaceae. A natural order of plants. The seeds of many 

 genera have hygroscopic hairs with spiral fibres, which make 

 them interesting microscopic objects. 



Acarinse, 179, 338 (Gr. akari, a mite). An order of the 

 Arachnidae, of which the cheese-mite is the type. 



Acephalocyst (Gr. a, kephale, kustis, a headless bladder). 

 Simple sacs filled with transparent liquid, usually known as 

 hydatids. They are the cysts of Echinococci, in which the 

 animals have disappeared or have been overlooked. 



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