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Bearing in mind that the massive church tower is the only 17th-century structure remaining above ground today, and the only building whose identity was therefore never lost, you will find only one other identified with positive assurance--the Ludwell House--Third and Fourth Statehouses row. The remaining 140 structures so far discovered by excavating have no clear-cut identity with their owners. To complicate matters more, bricks from many burned or dismantled houses were salvaged for reuse, sometimes leaving only vague soil-shadows for the archeologist to ponder. From artifacts associated with foundation traces, relative datings and, usually, the use of the structure can be deduced from physical evidence. Unless a contemporaneous map is someday found, we shall know little more than this about the houses at Jamestown except for the testimony of assorted hardware, ceramics, glassware, metalware, and other imperishable reminders of 17-century arts and crafts.

The parent birds attracted my attention by appearing with food in their beaks, and by seeming much put out. Yet so wary were they of revealing the locality of their brood, or even of the precise tree that held them, that I lurked around over an hour without gaining a point on them. Finally a bright and curious boy who accompanied me secreted himself under a low, projecting rock close to the tree in which we supposed the nest to be, while I moved off around the mountain-side. It was not long before the youth had their secret. The tree, which was low and wide branching, and overrun with lichens, appeared at a cursory glance to contain not one dry or decayed limb. Yet there was one a few feet long, in which, when my eyes were piloted thither, I detected a small round orifice.

A device often adopted in practice where a large number of assays of one kind are made, and the report is given as so many ounces or pounds to the ton, is that known as the _assay ton_. The assay ton may be any arbitrary and convenient weight, but its subdivisions must bear to it the same relations as pounds and ounces bear to the actual ton. On the other hand, in a laboratory where many kinds of work are performed, different sets of weights of this kind would only tend to confusion, even if they were not unnecessary. With a set of gram weights and its subdivisions anything may be done. If it is desired to report as pounds to the ton, then, since there are 2240 lbs. to the ton, a weight of 2.240 grams may be taken as the assay ton, and each 0.001 gram yielded will equal 1 lb., or 22.4 grams may represent the ton, and each 0.01 gram a pound. Similarly, since there are 32,666.6 ozs. troy to the ton; if we take 32.6667 grams as the assay ton, each 0.001 gram will equal 1 oz. to the ton. In some cases it may be convenient to have, in addition to the usual gram weights, one or other of the "assay tons" mentioned above, but generally it is better to work on a purely decimal system, and convert when required into ounces per ton, &c., either by actual calculation or by reference to a set of tables.

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