92 BURMA, ITS PEOPLE ASD PRODUCTIOXS. 



and Fiinrii. The moment tlie small cmLcddcd threads on tlic ohject glass are 

 connected with the points of the induction coil, the corpuscules visible in the field 

 of the microscope place themselves parallel to the current, that is, with their- longest 

 diameter in a straight line between the points, their progressive movement is wholly 

 arrested and their oscillatory motion is but feebly maintained. If the current is 

 now passed in a perpendicular direction, the corpuscules, instead of end to end, 

 range themselves side by side. If the current is arrested, the corpuscules resume 

 their irregular motions, and again fall into line as soon as its influence is perceptible. 



Class ACROGENS. 

 MUSCALES. 

 Plants composed of cellular tissue only. No prot/iallus. 



Order HErATICE..E. 



Stems leafy, with alternate or distichous leaves, or frondose. Antheridia consist 

 of delicate open sacs, full of cells, each enclosing an antkerozoid. The archegonia, 

 consist of a flask-shaped body enclosing a vesicle which, after fertilization, developes 

 a stalked urn-shaped sporangium, full of spores. Eoth antheridia and archegonia 

 may be terminal, axillary, attached to the uncler-surface of a stalked disk, or embedded 

 in the substance of the frond. Spores usually mixed with spiral filaments called 

 elaters. 



Ilepatieea are divided into five tribes. 



ANTEOCERIEJE. 

 Sporangium, silicuJou, 2-raIved, furnished wUh a central columelhi, covered with 

 elaters. 



MAECUANTIE^. 

 Sporangium furnished with elaters, but no columella. 



EICCIE. E. 

 Sporangium without columella or elaters. 



MONOCLEIE^E. 

 Sporangium solitary, opening longitudinally, tcitlout columella ; the elaters carried 

 away with the spores. 



JUNOERMANXIEyE. 

 Sporangium furnished with elaters, but no columella: archegonia and antheridia 

 developed at the extremity of the stem. 



Order SPHAGXA. 



Moss-like plants, difltering from mosses in their regular fascicled branches, 

 arising from the stem by the sides of the leaves, by some peculiarities in the 

 structure of the stem and leaves, and stalk of the sporangium., and by having 

 dimorphic spores. 



Order MUSCI. 



Stems leafy, leaves alternate or distichous. Antheridia consisting of delicate 

 open sacs full of cells, containing an antkerozoid. Archegonia consisting of a 

 flask-shaped body, enclosing a vesicle which, after fertilization, developes a stalked 

 urn-shaped sporangium full of spores. 



AXEIi^EACIE^. 

 Sehistocarpous mosses. Capsule borne on a pseudopodium not opereulute, but opening 

 by four longitudinal fissures, formi7ig four valves cohering by their lips {Andraa) or free 

 {Acroschisma). 



