BLASTOCHEME 



211 



BLEEDING 



Blastocheme (bias' -to-kem) [3jxiot6c, a germ ; ix etv > 

 to hold, to have]. In biology, a medusiform zooid 

 that gives origin to generative elements not imme- 

 diately, but through the intervention of sexual buds. 

 (Allman.) 



Blastochyle (blas'-to-kll) [3?aor6g, a germ ; xv/.6$, 

 juice]. In biology, the colorless fluid in the blasto- 

 dermic vesicles. 



Blastoccelum, Blastocceloma (blas-to-se'-lom, blas-to- 

 se-lo'-mah). Same as Blastocele. 



Blastocolla (blas-to-col'-ah) [3/-aaToc, a shoot ; Ko/.'/a, 

 glue]. In biology, the balsam produced on buds by 

 glandular hairs. 



Blastocolysis (blas-to-kol-i' 'sis) \_3'/.aaroc, a germ ; 

 ko/.ovgic, a cutting off]. The arrest of a develop- 

 mental process. 



Blastocyst (blas'-to-sist) [3'/.acr6r, a germ; kvgtic, a 

 bladder]. The germinal vesicle. 



Blastoderm (bias' -to-derm) [3/Uzarof, a germ ; dep/ia, 

 the skin]. In embryology, the germinal membrane 

 formed by the cells of the morula, lying on the inter- 

 nal surface of the vitelline membrane of the impreg- 

 nated ovum. The whole hollow sphere, with its sur- 

 rounding cells, is called the blastodermic vesicle, and 

 is formed about the tenth day. The ectoderm (or epi- 

 blast ) and the endoderm (entoderm or hypoblast ) layers 

 are simply due to a proliferation of the blastodermic 

 cells about the germinal area, whereby the blastoderm 

 is doubled, thus forming these outer and inner layers. 

 The mesoblast or middle layer is developed after the 

 latter, and probably from the hypoblast. 



Blastodermic (blas-to-der' -mik) \_3?.aaroc, a germ ; 

 dkpfia, the skin]. Relating to the blastoderm. 



Blastodisc (blas'-to-disk) [3/.aor6g, a germ; S'iokoc, 

 disc] . A blastodermic disc ; a mass or disc capping 

 one pole of the yolk. 



Blastogenesis (blas-to-jen' -es-is) \_37xlct6c, a germ ; 

 ykveoiq, generation]. In biology, Weismann's theory 

 of origin from germ-plasm (q.v.) in contradistinction 

 to Darwin's theory of Pangenesis. 



Blastogeny (blas-toj'-en-e) [Slaardc, a germ ; yeveotr, 

 generation]. Haeckel's term for the germ-history of 

 an individual organism ; a division of ontogeny. 



Blastoma (blas-to'-mah) [S/.aaror, a germ ; bpa, a 

 tumor: pl.,'Blastomata'\. A granular growth due to 

 the presence of a germ or microorganism. 



Blastomatic (blas-to-mat'-ik) [3>motoc, a germ; bua, a 

 tumor]. Relating to a blastoma. 



Blastomere (bias' -to-mer) \_3'f.aar6c, a germ ; aepoc, a 

 part] . Any one of the nucleated cells or segments 

 into which the fecundated vitellus divides. 



Blastomeric (blas-to-mer'-ik) [J/.aerroc, a germ ; fiepoc, 

 a part] . Relating to or of the character of a blasto- 

 mere. 



Blastoneuropore (blas-to-nu' -ro-por) [3?.ao-6c, a germ ; 

 vevpov, a nerve ; iropog, a pore]. In biology, the tem- 

 porary aperture in certain embryos formed by the 

 coalescence of the blastopore and neuropore. 



Blastophore (bias' -to-fbr) [3/.nor6-; a germ ; (fiepeiv, to 

 bear]. That part of a sperm-cell that does not be- 

 come converted into spermatozoa. 



Blastophyllum (blas-to-fil'-um) \_3~/.aoToc, a germ; 

 pi //or, a leaf: //., Blastophylla\ An endoderm or 

 an ectoderm ; a primitive germ-layer. 



Blastophyly (blas-tof -il-e) [/3/a<rr<5c, a germ ; 6v/Jj, 

 a tribe]. The tribal history of individual organ- 

 isms. 



Blastopore (blas'-to-por) [3/.arjT6r, a germ ; rropor, 

 passage, pore]. In biology, the primitive mouth or 

 archistome, the orifice to the two-layered embryo 

 (bt'astu/a). "The blastopore is the small opening 

 which leads into the notochordal canal, or after the 



canal has fused with the yolk-cavity, leads into the 

 archenteron. It is situated at the hind end of the 

 primitive axis (head-process) and marks the anterior 

 boundary of the anus of Rusconi in amphibia, or of 

 the primitive streak, properly so-called, of amniota." 

 (Minot). "Van Beneden's blastopore" is formed 

 previously to the blastodermic cavity. 



Blastosphere (bias' -to-sfer) \_3'/,a.G-6q , a germ ; opalpa, 

 a sphere]. In biology, the " blastula," "germinal 

 vesicle," or " vesicular germ." A hollow sphere 

 composed of a single, simple layer of germinal cells. 

 A vesicular morula. 



Blastostyle (bios' -to-stil) [.3?.a<xr6c, a germ ; ori/.or, 

 a pillar]. In biology, a columnar zooid devoted to 

 the origination of sexual buds. 



Blastula (bias' -tu-lah) [dim. of 3?.aar6g, a germ: //., 

 Blastula - ]. In embryology, " The earliest form of 

 the diaderm, a simple epithelial vesicle, the cavity of 

 which is the large segmentation cavity " (Minot). Cf. 

 Blastosphere. 



Blastulation (blas-tu-la'-shon) [dim. of 3Xnar6g, a 

 germ]. In embryology, the conversion of a morula 

 or mulberry-germ into a blastula or vesicular germ. 



Blatta (blat'-ah) [L. , "blood-colored"]. A genus of 

 the Blattidce. B. (Periplaneta) orientalis, the cock- 

 roach ; the powdered body of the cockroach. A pop- 

 ular remedy for dropsy among Russian peasants. It 

 increases the amount of urine and diminishes the 

 amount of albumin. Dose gr. iv— xx. Unof. See 

 A ntihy drop in . 



Blaud's Pill. A pill containing sulphate of iron and 

 carbonate of potash ; for use in amenorrhea, etc. See 

 Pill. 



Bleach (blech) [ME., blechtn, to make white]. To make 

 white or pale, to diminish the intensity of color. 

 Bleached Lac. See Lac. Bleaching Powder, 

 chlorinated lime, a mixture of calcium chlorid and 

 calcium hypochlorite, containing free chlorin gas. It 

 is much used as a disinfectant. Bleaching Fluid, 

 eau de Javelle, a similar composition obtained by pass- 

 ing chlorin gas into an emulsion of calcium hydrate. 

 The most important bleaching agents are the follow- 

 ing : Bleaching Agents. — Acids : Hydrochloric, 

 Nitric, Sulphurous ; Carbonate of Potassium (KjC0 3 ); 

 its value depends upon the percentage of carbonate it 

 contains; Caustic Soda (NaOH), a coarse white 

 powder ; Chlorid of lime, a white powder with a ch'o- 

 rinous odor ; it is the most important of all ; Hydrogen 

 dioxid (H 2 2 ), a colorless, odorless liquid. It is 

 called " Golden Hair-dye; " Permanganate of Potas- 

 sium (KjMn^Og) ; Soaps : Tallow, Rosin, and Olive 

 Oil ; Soda Ash (NajCC^) ; its value depends on the 

 amount of Na 2 it contains ; Soda Crystals (NajCOj.- 

 ioH 2 0). 



Bleacher's Eczema (blech'-erz ek'-zem-ah). Eczema 

 of the hands of bleachers, due to their continuous im- 

 mersion in hot water and strong lye. 



Blear Eye (bler'-i). See Blepharitis ulcerosa. 



Bleb (bleb). See Bulla. 



Blebby (bleb'-e) [Scotch, bleb, " a blister"]. Covered 

 with blebs. 



Blechropyra (blek-rop'-ir-ah) [SXrjxpbc, mild ; inp, 

 heat] . A transient fever ; a febricula. 



Blechrosphygmia (blek-ro-sfig' -me-ah) [37.r)xp6c, 

 weak; oovyuoq, pulse]. Weakness or slowness of the 

 pulse. 



Bleed (bled) [AS., bledan, to bleed]. To shed or give 

 vent to blood. 



Bleeders (ble'-derz) [AS., bledan. to bleed]. A popular 

 term for those who are subjects of the hemorrhagic 

 diathesis. B.'s Disease. See Hemophilia. 



Bleeding (ble'-ding). See Bloodletting and Hemorrhage. 



