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and their own expense provide proper and fit books of accounts and therein make just true legible and fair entries of the weight quantities and numbers of all and singular the several matters and things aforesaid, the weight being first ascertained by weighing machines and shall at all times produce and shew forth the same unto the said Superintendent for the time being or others aforesaid and permit him and them to take and make copies and extracts therefrom as he or they shall from time to time think proper And the said James George Lewis for himself his executors administrators and assigns doth hereby covenant and agree that he and they shall at no time suffer the said yearly sum of Two hundred and thirty pounds and ten shillings and the said several other and respective royalties or any or either of them or any part thereof to be behind and unpaid for the space of thirty days next after any of the said days on which the same are hereinbefore made due and payable And also that he the said James George Lewis his executors and administrators shall not at any time or times hereafter let or assign the said lands mines and premises or any part thereof to any person or persons whomsoever without the special license and consent of the Superintendent of the said province for the time being in writing under his hand And also that the said James George Lewis his executors administrators and assigns shall fairly work and carry on the same Coal mines and other works from the present and all future levels to the depth thereof in a workmanlike manner according to the best and most approved methods of carrying on the said works and well and effectually secure and ventilate all and every the pit and pits shaft and shafts which he his or their workmen or servants have sunk worked or dug or shall sink work or dig so that man and beast be free from danger thereby and as all and every thesaid pits become useless or not worth working therein shall immediately fence or fill up the said pit or pits shaft or shafts so as to be made secure and free from danger and at all times when the said mines are at work shall convey and cause to be conveyed down into and from and out of the said mines by in or upon the engines or machines by which he or his workmen shall be usually conveyed such person or persons as the Superintendent of the Province for the time being or his agent or agents shall at any time or times and from time to time name and appoint for the purpose and permit and suffer such person or persons to survey and inspect such mines and works to see whether the same are worked managed and carried on in a fair and workmanlike manner Provided always and it is hereby declared and agreed that the said James George Lewis his executors and administrators shall be entitled to abandon the working of the coal and manufactory and surrender this lease at any time during the aforesaid term of twenty-one years should he find the undertaking to be unprofitable upon six months previous notice in writing to the Superintendent of the said Province for the time being of such intention to abandon and surrender and upon payment to the Treasurer of the said Province for the time being of all rents royalties and other sums of money due by him in virtue of this Lease And the said James George Lewis for himself his executors administrators and assigns doth hereby further covenant that he and they at his and their own expense shall well and sufficiently keep and at the end or other sooner determination of this lease leave and yield up to the Superintendent of the said Province for the time being all such buildings and erections as are or hereafter shall or may be built or erected on said lands or any part thereof together with all useful pits shafts levels trenches and other works therein or belonging thereto in good and substantial condition and repair and also all the engines machinery and implements and working gear made use of in the said works the property of the said James George Lewis the said Superintendent paying a reasonable value to such engines machinery or implements at the end of such term such value to be ascertained by arbitrators to be chosen in manner aftermentioned in case the said Superintendent shall be desirous of purchasing the same and shall give to the said James George Lewis his executors administrators or assigns three months notice of such his intention previous to the end of the said term And also that the said James George Lewis his executors administrators and assigns shall during the said term provide and supply to the public good pit or large coal at a price including the cost of delivery on the bank of the Clutha river at the jetty to be erected for the use of the said coal works not exceeding the rate of twenty shillings per ton during the first two years of this lease and during the remaining years of the lease not exceeding the rate of twelve shillings per ton and shall at all times keep a supply of such coal under sheds on the bank of the river Clutha for the use of steam vessels frequenting that river and for the use also of the inhabitants of the Clutha District desiring to purchase the same And it is hereby declared that on failure of the said James George Lewis his heirs executors administrators or assigns to perform and