It was difficult for the boys to remind themselves that here they were precisely on the equator, so positively chilly was it.  And yet they were.  It was the third time which they had touched that imaginary girdle of the earth in the past week or so; and it was to be their last crossing.  How inspiring the thought that they were now within one hop of their goal; that sometime on the morrow they would probably reach Panama well within their time limit of ten days!