BLOOD-VESSELS. 



[ 8"' ] 



BCEHMERIA. 



theii* natural form. The red corpuscles of 

 the mammalia are readily distinguishable 

 from those of the lower classes in the animal 

 kingdom by their circular discoidal form and 

 the absence of a nucleus ; but those of indi- 

 vidual species can only be recognized by a 

 (htference in size. 



We shoidd recommend those who are 

 likely to undertake such investigations to 

 make their own table of sizes ; for it curi- 

 ously happens that in general the sizes of 

 the same objects given by different observers 

 varies considerably. This arises probably 

 from using too low a power, want of practice, 

 and the use of a false standard. And we 

 should not advise any one to attempt to form 

 a judgment in a question of this kind except 

 he be thorovighly acquainted with the use of 

 the microscope and micrometric investiga- 

 tions, and has made numerous experiments 

 upon this special point. 



The corpuscles of the blood are best stu- 

 died while existing in the serum of that li- 

 quid ; but the white of egg neutralized with 

 acetic acid exerts but little action upon them, 

 as is also the case with a solution of bichlo- 

 ride of mercury. The colourless corpuscles 

 are most easily recognized when the blood 

 has been mixed with water. 



They are best preserved when dried in a 

 very thin layer upon a slide ; a ch'op of blood 

 being placed upon the slide, and the latter 

 placed in a perpendicular position, so that a 

 ver\- thin layer will remain. 



BiBL. Paget, Brit, and For. Med. Rev. 

 xiv. p. 260; Kolliker, Hand. d. Gewehel. p. 

 567; the Manuals on Physiology, by Miiller, 

 Valentine, Wagner, Carpenter, Kirkes and 

 Paget; the Dictionaries of Todd and Bow- 

 man, and Wagner; Hassall, J/«cro5co/}./^wa^.; 

 Wharton Jones, Trans. Royal Soc. Lond. 

 1 846 ; Remak, Diagn. und Pathognet. Unter- 

 sucli. (Ed. Month. Jom'n.) 1845 ; Vogt. Jnn. 

 d. Sc. nat. 3 ser. ii. ; Gulliver, Gerber's 

 Anat. ; Ann. Nat. Hist. xvii. ; Schmidt, die 

 DiagnostikverddchtigerFlecke, &C.1848. See 

 also Chemistry, H^matoidixe, Chyl- 

 AQUEous LIQUID, and Literature. 



BLOOD-VESSELS. See Vessels. 



BLOXAMIA, Berk, and Br.— A genus of 

 Onygenei (?) (Ascomycetous Fungi), consist- 

 ing of minute, punctiform sacs, soon bursting 

 above, containing closely packed tubes pro- 

 ducing each a row of squarish spores. An 

 anomalous genus. B. truncata, has been 

 found on dead Wych elms. 



BiBL. Berk, and Broome, Ann. N. Hist. 

 2 ser. xiii. 468. pi. 16. fig. 17. 



BLYTIA,End- 



lich. — A genvis 

 of Pelliea3 (He- 

 paticacese) foun- 

 ded on the Jun- 

 germannia Ly- 

 ellii of Hooker, 

 remarkable for 

 the double enve- 

 lope of the fruit, 

 the outer being 

 very short, den- 

 tate and lacini- 

 ated, while the 

 inner forms a 

 largish, some- 

 what jdaited 

 cvlinder. The 



Fig. 63. 



Bljtia Lyellii, nat, size. 



antheridia arising from the rib are covered 

 by incumbent scales, which are some- 

 times much laciniated and crowded tos^ether, 

 sometimes (J. hibernica. Hook. BiHt. Jun- 

 germ.) scarcely toothed, lax and larger. 



BiBL. Hooker, Brit. Jung. t. 11 & t. 78 ; 

 Nees, Lebermoose, iii. 313; Flora Danica, t. 

 2004. 



BODO, Ehr. — A genus of Infusoria be- 

 longing to the family Monadina. (Monads 

 with a tail.) 



Char. A tail ; no eye-spot present ; mouth 

 terminal ; animals sometimes united in the 

 form of a mulberry or a bunch of grapes. 



Ehrenberg describes eight species. 



Some of them inhabit the intestinal canal 

 of the frog. One is green, the rest are co- 

 lourless. 



Dujardin regards one species (Bodo gran- 

 dis) as comprising both his Heteromita 

 ovata, and a species of Anisonema ; the 

 others he considers as imperfectly examined 

 species belonging to his genera Cercomonas 

 and Amphimonas. 



Bodo grandis, E. {Heteromita ovata, D.). 

 Aquatic; length 1-940 to 1-720" (PI. 23. 

 fig. 18 a). 



Bodo socialis, E. (PI. 23. fig. 18, b, c). 

 Aquatic; length 1-3000". 



Pritchard describes a species found in the 

 liquid contained in an oyster-shell, under 

 the name of Bodo oystea. 



BiBL. Ehrenberg, 7w/i(5.; Dujardin, iw/w5.; 

 Pritchard, Infus. Aniynalc. 



BCEHMERIA, Jacq.— A genus of Urtica- 

 ceous plants closely allied to our common 

 Stinging Nettle, and characterized, like that 

 and other species of Urtica, by containing 

 tenacious liber-fibres. Two species are em- 

 ployed in the East Indies on this account. 



