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 in the skin. These appear as nodules, sarcomatous-looking, soft and pulpy. Their colour is mottled, yellow and purplish red. The skin over them is thinned out, and broken down in places to form one or two crateriform ulcers from which a clear sticky fluid exudes. The size varies from that of a pea to a small orange. The pus is characteristic, varying in consistency though usually viscid, and containing numerous minute specks.

The disease is more common in males than in females, and more prevalent in Germany and Russia than in England. The infection is probably spread by grain (corn or barley), on which the fungus may often be found. In a great number of recorded cases the patient has been following agricultural pursuits. The disease can only be transmitted from one individual to another with considerable difficulty, and no case of direct transmission from animal to man has yet been noted.

Clinical History.—The course of actinomycosis is usually a chronic one, but occasionally the fungus gets into the blood, when the course is that of an acute infective disease or even pyaemia. The symptoms are entirely dependent on the organ attacked, and are in no way specially characteristic. During life a diagnosis of phthisis is continually made, and only a microscopic examination after death renders the true nature of the disease apparent. The nature of the skin lesion is the most evident, and here the parasite can be detected early in the illness. The only drug which appears to have any beneficial influence on the course of the disease is potassium iodide, and this has occasionally been used with great benefit. Surgical interference is usually needed, either excision of the part affected, or, where possible, a thorough scraping of the lesion and free application of antiseptics.

ACTINOZOA, a term in systematic zoology, first used by H. M. D. de Blainville about 1834, to designate animals the organs of which were disposed radially about a centre. De Blainville included in his group many unicellular forms such as Noctiluca (see ), sea-anemones, corals, jelly-fish and hydroid polyps, echinoderms, polyzoa and rotifera. T. H. Huxley afterwards restricted the term. He showed that in de Blainville’s group there were associated with a number of heterogeneous forms a group of animals characterized by being composed of two layers of cells comparable with the first two layers in the development of vertebrate animals. Such forms he distinguished as Coelentera, and showed that they had no special affinity with echinoderms, polyzoa, &c. He divided the Coelentera into a group Hydrozoa, in which the sexually produced embryos were usually set free from the surface of the body, and a group Actinozoa, in which the embryos are detached from the interior of the body and escape generally by the oral aperture. Huxley’s Actinozoa comprised the sea-anemones, corals and sea-pens, on the one hand, and the Ctenophora on the other. Later investigations, whilst confirming the general validity of Huxley’s conclusions, have slightly altered the limits and definitions of his groups. (See, , and .)

ACTION, in law, a term used by jurists in three different senses: (1) a right to institute proceedings in a court of justice to obtain redress for a wrong (actio nihil aliud est quam jus prosequendi in judicio quod alicui debetur, Bracton, de Legibus Angliae, bk. iii. ch. i., f. 98 b); (2) the proceeding itself (action n’est auter chose que loyall demande de son droit, Co. Litt. 285 (a)); (3) the particular form of the proceeding. The term is derived from the Roman law (actio), in which it is used in all three senses. In the history of Roman law, actions passed through three stages. The first period (terminated about 170 by the Lex Aebutia) is known as the system of legis actiones, and was based on the precepts of the XII. tables and used before the praetor urbanus. These actiones were five in number—sacramenti, per judicis postulationem, per condictionem, per manus injectionem, per pignoris captionem. The first was the primitive and characteristic action of the Roman law, and the others were little more than modes of applying it to cases not contemplated in the original form, or of carrying the result of it into execution when the action had been decided. The legis actiones were superseded by the formulae, originated by the praetor peregrinus for the determination of controversies between foreigners, but found more flexible than the earlier system and made available for citizens by the Lex Aebutia. Under both these systems the praetor referred the matter in dispute to an arbiter (judex), but in the later he settled the formula (i.e. the issues to be referred and the appropriate form of relief) before making the order of reference. In the third stage, the formulary stage fell into disuse, and after 342 the magistrate himself or his deputy decided the controversy after the defending party had been duly summoned by a libellus.

The classifications of actiones in Roman law were very numerous. The division which is still most universally recognized is that of actions in rem and actions in personam (Sohm, Roman Law, tr. by Ledlie, 2nd ed. 277). An action in rem asserts a right to a particular thing against all the world. An action in personam asserts a right only against a particular person. Perhaps the best modern example of the distinction is that made in maritime cases between an action against a ship after a collision at sea, and an action against the owners of the ship.

In English law the term “action” at a very early date became associated with civil proceedings in the Court of Common Pleas, which were distinguished from pleas of the crown, such as indictments or informations and for suits in the Court of Chancery or in the Admiralty or ecclesiastical courts. The English action was a proceeding commenced by writ original at the common law. The remedy was of right and not of grace. The history of actions is the history of civil procedure in the courts of common law. As a result of the reform of civil procedure by the Judicature Acts the term “action” in English law now means at the High Court of Justice “a civil proceeding commenced by writ of summons or in such other manner as may be prescribed by rules of court” (e.g. by originating summons). The proceeding thus commenced ends by judgment and execution. This definition includes proceedings under the Chancery, Admiralty and Probate jurisdiction of the High Court, but excludes proceedings commenced by petition, such as divorce suits and bankruptcy and winding-up matters, as well as criminal proceedings in the High Court or applications for the issue of the writs of mandamus, prohibition, habeas corpus or certiorari. The Judicature Acts and Rules have had the effect of abolishing all the forms of “action” used at the common law and of creating one common form of legal proceeding for all ordinary controversies between subjects in whatever division of the High Court. The stages in an English action are the writ, by which the persons against whom relief is claimed are summoned before the court; the pleadings and interlocutory steps, by which the issues between the parties are adjusted; the trial, at which the issues of fact and law involved are brought before the tribunal; the judgment, by which the relief sought is granted or refused; and execution, by which the law gives to the successful party the fruits of the judgment.

The procedure varies according as the action is in the High Court, a county court or one of the other local courts of record which still survive; but there is no substantial difference in the incidents of trial, judgment and execution in any of these courts. The initial difference between actions in the High Court and the county court is that the latter are commenced by plaint lodged in the court, on which a summons is prepared by the court and served by its bailiff, whereas in the High Court the party prepares the writ and lodges it in court for sealing, and when it is sealed, himself effects the service.

An action is said to “lie” when the law provides a remedy for some particular act or omission by a subject which infringes the legal rights of another subject. An act of such a character is said to give a “cause of action.” In the action the person who alleges himself aggrieved claims a judgment of the court in his favour giving an adequate and appropriate remedy for the injury or damage which he has sustained by the infraction of his rights. As to the time within which an action must be brought, see. When the rights of a subject are infringed by the illegal action of the state, an action lies in England against the officers who have done the wrong, unless the claim be one arising out of breach of a contract with the state, or out