And in respect the lessees are taken bound, as after-mentioned, to expend yearly for five years certain sums on the improvement of the property hereby let, the one half of which is to be repaid to them by the proprietors in the manner afterwards stated: And whereas they contemplate getting their half of these improvements executed by their sub-tenants under certain stipulations in the sub-leases after mentioned, the condition of which sub-leases are new in Shetland, and a number of the tenants may decline to enter into them, thus leaving vacant farms, and entailing on the lessees themselves the half of the expense of carrying out the improvements upon these farms; it is hereby provided and declared, and the said Thomas Mouat Cameron, for himself and his foresaids, their heirs and successors, binds and obliges him and them, that should such a number of the said farms remain vacant as to entail of annual outlay an annual amount altogether exceeding one hundred pounds sterling, he and they shall be bound to advance any excess of that sum, making an annual rent-charge upon the lessees of 10 per cent. on their half of said advance (as, for example, should improvements to the value of only six hundred pounds per annum be effected by means of the sub-tenants, leaving three hundred to be expended by the lessees, the proprietors would, in such case, advance the agreed-upon four hundred and fifty pounds at six pounds fourteen shillings per cent. per annum, and of the one hundred and fifty pounds expended by the lessees, the excess of one hundred pounds -- namely, fifty pounds -- at a rentcharge of ten per cent. per annum): And where as some of the houses on the property hereby let are not in good repair, the said Thomas Mouat Cameron binds and obliges himself, and his and their foresaids, to put the same in good tenantable order and condition within two years from the commencement of this lease ..... And it is hereby provided and declared that this lease is granted, and the same is hereby accepted, under the restrictions and reservations, and subject to the following conditions, viz.: <First>, That the said lessees and their foresaids shall annually, during the first five years of this lease, and that before the first day of September in each year, expend, either by themselves or by their sub-tenants, under rule 5 of the rules and regulations for sub-leases, afterwards referred to, and annexed hereto, upon permanent improvements upon the subjects hereby let, in such a way as may be pointed out by the proprietors or their factor (the laying off and subdividing the ground to be improved to be at the expense of the proprietor), the sum of nine hundred pounds sterling per annum; it being provided and declared that the first annual expenditure, or as much thereof as the lessees may require, shall be made on fencing, subject always, however, to the aforesaid sanction of the said proprietors or their factor; the one half of said sum, viz.