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250 especially) with such an abundance of natural-history material, that at the end of a one hundred years it had not all been worked up.

That these collections were largely the work of Marcgrave seems more than likely. And indicative of the care which he bestowed on his specimens and of the value set upon them as a result, the following quotation from Manget is in point.

With reference to Marcgrave's mathematical and astronomical work, we know little about its extent and even less about its content. That he drew plans for camps, cities and fortifications, and made maps of the regions explored, we are told by the writer in Manget. In addition to these there were MSS. of more important character brought back by Count Maurice from Brazil.

De Laet, who was Marcgrave's literary executor, tells us in the preface to Marcgrave's part of the 1648 folio that from notes found among Marcgrave's papers it is clear that our author had worked up his mathematical and astronomical data into a great work in three parts under the title, "Progymnastica Mathematica Americana."

From certain statements found in the various prefaces and introductions to both the 1648 and 1658 folios, it seems rather probable that Piso had charge of these MSS.; but at any rate it is certain that practically all of the papers in the first and second sections were by order of Count Maurice or De Laet turned over for editing and publication to Golius, the Leyden astronomer and former teacher of Marcgrave. Unfortunately, they seem to have been lost, at any rate, it is certain that they were never published.