LASION 



329 



LAW 



folium, L. It forms colorless rhombic crystals, melting 

 at 1 14 C. , soluble in benzene, chloroform, and ethereal 

 oils. 



Lasion (la'-se-on) ['/.dacov, hairy-, shaggy]. Anything 

 rough, hairy, or shaggy. 



Lasios (/ti'-zi-os) [/ucioc, rough]. Shaggy, rough, 

 hairy. 



Lateral. (See Illus. Diet.) L. -chain. See Receptor. 

 L. -chain Theory of Ehrlich, this theory presupposes 

 that the stimulating substances introduced into the cir- 

 culation have the power of combining with certain 

 groups of molecules in the protoplasm of certain cells ; 

 which combination is succeeded by a regeneration of 

 the lateral chains. When more of the combining sub- 

 stance is injected and the combining lateral chains 

 again consumed, another still more copious regenera- 

 tion occurs, and so on until the particular lateral chains 

 are present in great excess and pass out of the cells into 

 the blood, where they are known as antitoxin. See 

 Ehrlich' s Side-chain under Immunity. 



Laterodeviation (lat-ur-o-de-ve-a' 'shun) [latus, side; 

 dtviare, to deviate]. Slight displacement or deviation 

 to one side. 



Lateroduction (lat-ur-o-duh' 'shun) [lotus, side ; 

 re, to lead]. Lateral movement of the eye. 



Lateroposition {lat-ur-o-po-zish'-un) [lotus, side; 

 ure, to place]. Displacement to one side. 



Laterotorsion 1 lat-ur-o-tot'shun) [latus, side ; torquere, 

 to turn]. A twisting to one side. 



Laticapitate (lat-e-kap'-it-dt) [latus, broad; caput, 

 head]. Having a broad head. 



Latrodectus (Jat-ro-dek'-tus) [/Arpig, a hired servant, a 

 robber; fii/Krr/c, a biter]. A genus of spiders of the 

 family Theria'iid.c, containing many widely distributed 

 poisonous species. The dreaded menavody spider of 

 Madagascar perhaps belongs to this genus. L. con- 

 globatus, a poisonous species of Greece, the Grecian 

 marmagnatto, the asterion of Nikander and probably 

 identical with L. tredecimguttatus. L. curassavicus, 

 Husemann, a poisonous species greatly feared in Cura- 

 coa. L. formidabilis. Frederico Puga Borne, a 

 poisonous species greatly feared in Chili. L. haseltii 

 and L. scelio, two poisonous species of Australia and 

 New Zealand known as katipo. L. lugabris. Mot- 

 schulskv, a species greatly feared in southeastern Rus- 

 sia and southern Asia, where it bears the Tartar name 

 of kara-kurt, and among German colonists that of 

 schwartzer Wolf or schwartze Witwe. It is probably 

 identical with Z. tredecimguttatus, var. erebus, Dou- 

 four. L. mactans, Walckenaer, a poisonous species 

 of the south and southwestern United States. It 

 secretes a powerful hemolytic enzyme which is said to 

 be used as a homeopathic remedy in angina. L. 

 malmignatus, Walckenaer, a poisonous species of 

 southern Europe, probably identical with Z. tredecim- 

 guttatus. L. quinque punctatus, Krynicki, a poison- 

 ous Russian species probably identical with Z. trede- 

 cimguttatus. L. tredecimguttatus ( Rossi |, Fabricius, 

 a species secreting a powerful hemolytic enzyme; the 

 malmignatto of Italy and southern Europe ; the rhoa 

 of Nikander, the rhagion of Jacob Grevini, the kara- 

 kurt of southern Asia, the tendaraman of Morocco. 



LztiuncxiXaxious (lat-runk-u-la' -re-us) [latruncularius, 

 a chess-board] . In biology', presenting the appearance 

 of a chess-board. 



Laurene \ru '-rtn . A dimethyl propylbenzene formed 

 bv distillation of camphor with zinc chlorid ; it boils at 

 188 C. 



Laureol lau^-re-ol). The proprietary name for a mix- 

 ture of cocoanut oil and palm oil. 



Laurie la-.i^-rik) [Celtic lauer, green]. Relating to 

 the genus Laurus, the laurels. 



Laurocerasin {law-roser* '-as-in). See Amygdalin, 

 Amorphous. 



Laurostearin {law-roste* -at -in). C j H.(C 11 Hj 3 Oj)j. 

 A constituent of the fruit of Laurus nobilus. It forms 

 fine, white, stellate or dendritic groups of crystals melt- 

 ing at 46 C. and readily soluble in ether. 



Laurostearone (lazo-roste'-ar-dn). CjjH^O. White 

 crystals obtained by dry distillation of calcium laurate ; 

 fuses at 66° C Syn., Laurone. 



Laurotetanin (lazo-ro-tet'-au-in). C 19 H,jN0 5 . An 

 alkaloid obtained by Greshoff from the bark of Litsea 

 citrata, Blume., and a number of other plants of the 

 order Laurincu. It is said to be a powerful poison, 

 acting like strychnin on the spinal cord. 



Lautissimus (lam-to 1 'im-us) [laittus, washed]. Most 

 thoroughly purified or rectified. 



Lavage. (See lllus. Diet.) L. of the Blood, L. du 

 Sang, washing toxic products from the blood-stream 

 by intravenous injection of artificial serum in large 

 doses. 



Laveran's Crescents. See Crescent. 



Law. (See Illus. Diet.) L., Aran's, fractures of the 

 base of the skull are the result of injury to the vault, 

 the extension taking place by irradiation along the line 

 of the shortest circle. The fractures of the base which 

 occur by contrecoup are exceptions to this law. L.., 

 Bastian's, L., v. Brun's, when there exists a com- 

 plete transverse lesion of the spinal cord above the 

 lumbar enlargement, the tendon reflexes of the lower 

 extremities are abolished. L., Beaumes-Colles'. 

 See Law, Collei (Illus. Diet.). L., Behring's, the 

 blood and blood-serum of an individual who has been 

 artificially rendered immune against a certain infectious 

 disease may be transferred into another individual with 

 the effect of rendering the other also immune. L., 

 Bell-Magendie's. See Z., BelV s (Illus. Diet). 

 L., Biogenetic, a certain tendency directs the drift or 

 trend of development of a being along a line parallel 

 with that of the series of forms ancestral to it. The 

 being in the course of its development briefly recapitu- 

 lates that of the ancestral series to which it belongs. 

 Syn., Mailer's la~u: L., Buhl-Dittrich's, in every 

 case of acute general miliary - tuberculosis an old focus 

 of caseation is to be found someyvhere in the body. 

 This law, being based upon the belief in the etiologic 

 nonidentity of diffuse caseous and miliary tuberculosis, 

 is not strictly in conformity with modern views. L., 

 Bunge's, the epithelial cells of the mammary- gland 

 (of the rabbit, cat, and dogi select from the mineral 

 salts of the blood-plasma all the inorganic substances 

 exactly in the proportion in yvhich they are necessary for 

 the development of the offspring and for the building 

 up of the latter s organism. L., Cohn's, the specific 

 form of bacteria has a fixed immutable basis. L., 

 Courvoisier's (R. C), Concerning Gall-stones. 

 See under Gall-stones. L.. Courvoisier's, tumors of 

 the head of the pancreas almost invariably cause dila- 

 tion of the gall-bladder. L., Cushing's, an increase 

 of intercranial tension occasions a rise of blood-pressure 

 which tends to find a level slightly above that of the 

 pressure exerted against the medulla. It is thus seen 

 that there exists a regulatory- mechanism on the part 

 of the vasomotor center which, with great accuracy, 

 enables the blood-pressure to remain at a point just 

 sufficient to prevent the persistence of an anemic con- 

 dition of the bulb, demonstrating that the rise is a con- 

 servative act and not one such as is consequent upon 

 a mere reflex sensory irritation. L., Descartes'. See 

 Z., Snells. L., Du Bois-Reymond's, it is not the 

 absolute value of current density at a given moment 

 that acts as a stimulus to a muscle or motor nerve, but 

 the variation of density. L., Edinger's. See under 



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