BLOOD-VESSELS. 



C 



BCEHMERIA. 



their 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 

 difference in size. 



We should 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 loo 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 thoroughly 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 drop of blood 

 being placed upon the slide, and the latter 

 placed in a perpendicular position, so that a 

 very thin layer will remain. 



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

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

 567; the Manuals on Physiology, by Miiller, 

 Valentine, Wagner, Carpenter, Kirkes and 

 Paget ; the Dictionaries of Todd and Bow- 

 man, and Wagner; Ha.sssi\\,Microscop.Anat.; 

 Wharton Jones, Trans. Royal Soc. Lond. 

 1846 ; Remak, Diagn. und Pathognet. Unter- 

 such. (Ed. Month. Journ.) 1845 ; Vogt. Ann. 

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

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

 Diagnostik verdacktigerFlecke, &c. 1848. See 

 also CHEMISTRY, H^EMATOIDINE, 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- 



Fig. 63. 



Blytia Lyellii, nat. size. 



BLYTIA,End- 

 lich. A genus 

 of Pellie (He- 

 paticacea3) 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 plaited 

 cylinder. The 

 antheridia arising from the rib are covered 

 by incumbent scales, which are some- 

 times much laciniated and crowded together, 

 sometimes (J. hibernica, Hook. Brit. Jun- 

 germ.} scarcely toothed, lax and larger. 



BIBL. Hooker, Brit. Jung. t. 77 & 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 J-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, In/us.-, Dujardin, Infus.; 

 Pritchard, Infus. Animate. 



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. 



