“(3) To pay to the Company by means of the contributions mentioned in Clause 3(4) hereof a one seventh part of all moneys expended by the Company in observing and performing the covenants contained in clause 4 hereof and of all expenses incurred by the Company in carrying out the objects for which the same is incorporated other than those referred to in Clause 4 hereof (4) To pay to the Company in each year during the said term by equal half yearly payments on the Twenty-fifth day of December and the Twenty-fourth day of June in every year a sum estimated by the Company to be the anticipated liability of the Lessee for the year commencing on the twenty-fifth day of December in each year in respect of the items mentioned in Clause 4(1) to (4) hereof any further to pay to the Company on the signing hereof the sum of One hundred pounds on account of such liability up to the twenty-fifth day of December next and further to pay to the Company within twenty-one days of delivery of the Statement of Account referred to in Clause 4(5) hereof any deficit due from the Lessee in respect of the previous year”