On appeal the learned judge of the Supreme Court, after a careful review of the authorities, expressed the view that the onus lay upon the prosecution to establish that Shannon was not an exempt person and that therefore the conviction was supportable only if there was evidence on this issue. With his Honour's view on this point we agree. The prosecution, however, contended that the issue whether Shannon had been excluded by notice from the operation of the Aboriginals Ordinance was the subject matter of an exception proof whereof rested upon the appellant. But, apart from the provisions of sub-s. (2) of s. 141, there are no words of exception in that section. The relevant exception, if there is one, is contained in s. 3A of the Aboriginals Ordinance, which is one of the material provisions to be applied in determining the class of persons in dealings with whom an offence under s. 141 may be committed. The circumstance that this class is variable and indeterminate and that it must be ascertained by considering, in addition to the definitions contained in s. 3 of the Aboriginals Ordinance, the provisions of s. 3A and declarations thereunder, whether by way of exemption or revocation, does not touch the question, for even if terms of s. 3A should be construed as words of exception from the section which precedes it, they do not constitute an exception from the provisions of s. 141 of the Liquor Ordinance. The class of person specified in that section is not defined by reference to the provisions of s. 3 of the Aboriginals Ordinance and thereafter or therein an exception made, but by reference to a narrower class of persons - those to whom the definitions of "aboriginal" or "half-caste" apply. Ex parte Ferguson; Re Alexander [1] is an illustration of a statutory offence described in terms which introduced a true exception and in that case Jordan C.J. concisely stated the relevant principles: "In these cases, a special rule of construction became established at common law. If the offence were defined as consisting of a single concatenation of factors, all were regarded as necessary ingredients of the offence, whether they were positive or negative in their nature; but, if the definition were twofold, in the sense that after a definition of the offence there was a distinct and separate provision exempting from liability in a certain event, only the first part was regarded as defining the ingredients of the offence, and the second was regarded as matter of confession and avoidance available by way of defence" [1] . After referring to the provision made by s. 145A (2) of the Justices Act 1902-1940 N.S.W., his Honour proceeded: "Section 14 of the Commonwealth Crimes Act, 1914 as amended, dealing with persons charged before a Court of summary jurisdiction with an offence against a law of the Commonwealth, is substantially to the same effect. A substantially identical provision was contained in the English Licensing Act, 1872 (35 & 36 Vict. c. 94), s. 24, and it was explained by Blackburn J., in Roberts v. Humphreys [2] that it was pointed against decisions of the Court of Common Pleas under Jervis' Act (11 and 12 Vict. c. 43), and made it incumbent on the defendant to prove any exception in his favour. In my opinion, what is meant by s. 14 of the Commonwealth Crimes Act, 1914, is that, as a matter of evidence, it is for the defendant to prove any exception, whether it be associated with or separate from the description of the offence, and that, as a matter of pleading, it is unnecessary for the prosecutor to specify or negative it, but if he does, it is unnecessary for him to give any proof in relation to it: Bell v. Hyde [3] . It is, of course, in every case a question of construction whether any particular words are words of exception" [4] . Barritt v. Baker [5] is an illustration of an offence created by a provision which contained a negative element as one of the essential ingredients of the offence and not as an exception. In dealing with the point Fullagar J. referred to s. 214 of the Justices Act 1928 Vict. and proceeded: "The history and purpose of this section are explained in Roberts v. Humphreys [6] , and it has been discussed in Victoria notably in Shillinglaw v. Roberts [7] ; Donoghue v. Terry [8] ; Bell v. Hyde [9] ; De La Rue v. Matthews [10] . The section is expressly made applicable "whether the exception, etc., does or does not accompany in the same section the description of the offence". Thus there need not be, in order to attract the operation of the section, a description of the offence followed by an express and separate statement of the exception. So, in Shillinglaw v. Roberts [1] the charge was laid under a section which ran in this form: "Every person other than a legally qualified medical practitioner or a registered pharmaceutical chemist who shall sell any poison shall" be guilty of an offence. It was held that the burden lay upon the person charged of proving that he was a medical practitioner or a chemist. On the true construction of the Act there is a general prohibition of the selling of poisons, and two classes of persons were exempted; the person charged is required by sec. 214 to prove, if he can, that he is within one of the exempted classes. But the section will not, in my opinion, operate to relieve the prosecutor from proving any fact which is an essential element in the specification of the prohibited act. So in Donoghue v. Terry [2] the statute in question made it an offence to "use a motor car without the consent of the owner". There was no general prohibition subject to an exception; the absence of the owner's consent was an essential element in the specification of the prohibited act, and Lowe J. held that it must be proved by the prosecution. In the present case the prohibited act is specified (to put it shortly) as "betting in a street". The place is an essential element in the specification of the offence, and the prosecution must prove not merely the making of a bet but the making of a bet in a street. The word "street" is defined in an "extensive" definition, in which words of exception occur. A place is a street if it is enclosed or unenclosed land other than a race-course. But the prosecution must prove that the place is a street, and the prosecution fails to prove this unless it proves that the place comes within the definition. And it does not prove that the place comes within the definition unless it proves not merely that it was enclosed or unenclosed land, but also that it was not a race-course. As I have said, I do not think it was disputed here that the evidence failed to establish that the place was not a race-course within the statutory meaning of that word. And, in my opinion, the justices were right in holding that, unless the evidence established that, the prosecution failed. It was argued with considerable force that this view in this case reduced the whole question of the application of sec. 214 to a matter of form rather than substance. It was said that the substantial effect of the legislation was to enact that any person who bets on any land other than a race-course should be guilty of an offence, and that, if the legislation had taken that form, it must have been held that betting on a race-course was an exception within the meaning of sec. 214. But it seems to me that the question must often turn on the form of the legislation. The problem is not a problem of formal logic. The Court is not to undertake the task of classification and to decide what is the logical statement of the rule and the logical statement of the exception. Its task is purely and simply one of statutory construction. It has only to say what are the elements which the Legislature has specified as the prima facie ingredients of the offence. When it has determined, as a matter of construction, what those ingredients are, it necessarily follows that the burden of proving the totality of those ingredients rests upon the prosecution. The solution of the logical problem of the classification of things is governed by logical considerations, and logical considerations will determine what is to be stated as a rule and is to be stated as an exception. But the Legislature may formulate its rule or its rule and exception as it pleases. It might, for example, provide that any person who made a bet in a city, town or borough should be guilty of an offence. Or it might provide that any person who made a bet in any municipality other than a shire should be guilty of an offence. The substance might be precisely the same, but it might well be held that sec. 214 applied to the latter case but not to the former. This would be because the essential elements in the specification of the offence are differently stated in each case. Here the Legislature has indicated that what it requires to be proved is the making of a bet in a street. And that is not proved unless evidence is adduced to warrant the conclusion that the place is beyond reasonable doubt a street within the statutory definition. It is immaterial, I think, that that definition involves a negative" [1] . We find ourselves in complete accord with the observations contained in these two passages, and applying the principles therein referred to, it follows that the issue whether Shannon was an "unexempt person" was not the subject matter of an exception, but was one of the ingredients of the offence.