( '7J ) 
datis reef is ; & vice verfa ex bis datis refits deter mi nari pojje : 
& methodum indie at am illujlraveram diverfis feriebus . 
Mr. Collins in the Years 1669, 1670, 1671 and i67z gave 
notice of this Compendium to Mr James Gregor y in Scotland „ 
Mr. Bertet and Mr. Vernon then at Paris , Mr. Alpbonfus Borelli 
in Italy, and Mr. Strode, Mr. Torrnfend, Mr. Oldenburgh, 
Mr. Vary and others in England, as appears by his Letters. 
And Mr. Oldenburg in a Letter, dated Sept. 14. 1669. and 
enrred in the Letter-Book of the Royal-Society, gave notice 
of it to Mr. Francis Slufius at Liege, and cited feveral Senten- 
ces out of it. And particularly Mr. Collins in a Letter to 
Mr. James Gregory dated Novemb. 2$. 1669. fpake thus of the 
Method contained in it. Barrovius Provinciam fuam publice 
pralegendi remifit cuidam nomine Newtono Cantabrigienfi, cujus 
tanquam viri acutijjimo ingenlo praiditi in Praefatione Preelefiionum 
Opticarum , meminit : quippe antequam ederetur Mercatoris Lo- 
garitbmotechnia, tandem methodum adinvenerat, eamque ad on, f 
ves Curvas generaliter (Jr ad Circulum diverjimode applicarat. 
And in a Letter to Mr. David Gregory dated Augufi 1 r- 1676. 
he mentions it in this manner. Paucos pofi menfes quam edits 
funt hi Libri [viz. Mercatoris Logarithmotechnia 3 r Exercita- 
tiones Geometrical Gregorii] mijfijunt ad Barrovium Cantabri- 
gian TUe autem rejponfum dedit hanc infinitarum Seriernm Dofiri - 
nam a Newtono biennium ante excogitatam fuifle quam ederetur 
Mercatoris Logarithmotechnia & generaliter omnibus figuris ap± 
plicatam, ftmulque tranfmifit D. Newtoni opus manuferiptum. 
The laft of the faid two Books came out towards the End 
of the Year 1668, and Dr. Barrow fent the faid Compendi- 
um to Mr. Collins in July following, as appears by three of 
Dr. Barrow's Letters. And in a Letter to Mr. Strode , dated 
July 16. Mr. Collins wrote thus of it. Exemplar ejus 
[[Logarithmotechnia] mifi Barrovio Cantabrigiam, qui qtsajdam 
Newtoni chart as extempTo remijit : E quibu* & aliis qua prius ab 
author e cum Barrovio communicata fuerant, patet illam methodum 
a difio Newtono aliquot annis antea excogitatam & modo univer • 
F f t fall 
