SPACE

n. Spas. Gr., x<"Pa- Lat., tpatium. Fr., espnce. Ger., Raum. Continuous extension in the tnree dimensions of length, breadth, and thickne ; in a popular restricted sense, room, empty or vacant s. [a, 48.] Air-s. Fr., couronne. Ger., Luftraum. Syn.: air-chamber. 1. An accumulation of air at the rounded end of an egg, between the middle and internal fibrous envelopes, which penetrates through the shell to replace a certain amount of the watery material of the egg lost by evaporation. [A, 17.] 2. In a plant, see under LACUNA (2d def.). Anterior perforated s. Lat., locus perforatus anterior (seu prceperforatus), subs tanti a per for at a, lamina cribrosa antic a. Fr., lame criblee (anterieure), espace perfore anterieur, substance perforee anterieure. Ger.. vordere durchlbcherte Substanz, Siebplatte. A. triangular s. on the lower surface of each cerebral hemisphere, bounded anteriorly by the three roots of the olfactory nerve, posteriorly by the optic tract, and externally by the beginning of the Sylvian fi ure. It corresponds to the lower portion of the corpus striatum, and is pierced by a number of blood-ve els which enter that body. [I, 2 (K).] Arachnoid s. See Subarachnoid s. and Subdural s. Biopla on s'8. The parts which remain unstained when connective ti ue is treated with silver nitrate; considered by von Reckling hausen to be lymph-s's in the basis-substance, but supposed by Heitzmann to be either unstained biopla on or cavities containing it. [J, 26.] See also CELL-S. (1st def.). Blopd-s's (of the placenta). See Inter villous LACUNA. Bregmatic s. See Anterior FONTANELLE. Cell-s's of connective ti ue. S's, rather larger than the cells of connective ti ue, in which the ti ue-cells are contained. [C.] Cir cum cellular s. See CELL-S. Cir cum vascular lymph-s's. Ger., perivasculare Rciume. Tubes surrounding blood-ve els and communicating with true lymphatic ve els. [L.] Contractile s. See Contractile VACUOLE. Douglas's s. See Recto-uterine POUCH. Epicerebral s. See ESPACE lymph at i que epicerebral. Epidural s. of the spinal canal. Of Waldeyer, a lymph-s. between the periosteum lining the vertebral canal and the spinal dura. [J, 17 (K).] Fontana's s. See CANAL of Fontana.-WAvers i an s's. Fr., espaces haver siens. Ger., Havers'1sche Raume. Irregular s's found especially in growing bones. They have jagged outlines, and appear to be the result of the absorption of compact bone. Such a s. may become filled by the development of Havers i an systems within it. [J, 24, 43.] Inter arytaenoid s. See ESPACE interaryteno'idien. Intercellular s's. 1. Minute s's between the intercellular apophyses of prickle-cells. They are cro ed by the intercellular bridges. [J.] 2. Cavities, minute or large, formed in the ti ues of plants either by the unequal growth or splitting of walls separating adjacent cells or by the destruction of intermediate cells. The former mode of development is known as schizo gen ous, the latter as lysigenous. They are found chiefly in mature ti ues, and may contain air, water, crystals, or milky or resinous secretions, etc. [a, 35.] Intercostal s's. Fr., espaces O, no; O3, not; O3, whole; Th, thin; Th", the; U, like oo in [s. 505]