914 Penalty. Safeguards to traders. Inconsider- able variation. Deficiency due to bond fide mistake cr accident. Deficiency due to nnavoidable evaporation or drainage. Defendant who purchased article entitled to rely on warranty given him by the vendor. Ch. 31. No. 15.] Weights and Measures. 53. Any person who contravenes the provisions of section 51 shall be liable to a fine in the case of a first offence of twenty-four dollars, and in the case of any subsequent offence of two hundred and forty dollars. 54. In any proceedings under this Ordinance— (a) in respect of an alleged deficiency of weight or measure of any pre-packed article, the court shall disregard any inconsiderable variation in the weight or measure of a single article, and shall have regard to the average weight or measure of a reasonable number of other articles of the same kind (if any) sold or de- livered by the defendant, or in his possession for the purpose of sale or delivery, on the same occasion and generally to all the circumstances of the case; (b) in respect of an alleged deficiency of weight or measure or number, if the defendant proves to the satisfaction of the court that such deficiency was due to a bond fide mistake or accident, or other causes beyond his control, and in spite of all reasonable precautions being taken and all due diligence exercised by the said defendant to prevent the occurrence of such deficiency, or was due to the action of some person over whom the defendant had no control the defendant shall be discharged from the prosecution ; (c) in respect of an alleged deficiency in the weight of any article delivered to a purchaser, the defendant shall be discharged from the prosecution if he proves to the satisfaction of the court that the alleged deficiency was due to unavoidable evaporation or drainage and that due care and precaution has been taken to avoid such deficiency. 55. (1) If in any proceedings under this Ordinance in respect of any pre-packed article the defendant proves that he purchased the article in the wrapper or container in which he sold it or had it in his possession for the purpose of sale and with a written warranty of the weight or measure or number of the article, and that he had no reason to believe, at the time when he sold it or had it in his possession for the purposes of sale, that the article or its wrapper or container