5io Mr. herschel’s Agronomical Obfervations 
He fays, in his Selenography, p. 266. “ Vera diftan*- 
u tia illuftratarum cufpidum, a confinio luminis et um^ 
“ br®, prsefertim tempore quadratures, invenitur, una 
“ vigefima fexta parte, totius Lunee dimetientis con- 
“ flare; quando. nimirum font retnotiffimae : quemad- 
“ modum hoc ex phafi trigeflma fecund a, monteque 
u Apennino; ex phafi trigeflma prima, monteque Di- 
“ dyme; et trigeflma phafi, monteque Tauro et Anti,- 
“ tauro, manifeftiffime demonftratur.” Having after- 
wards mentioned that galileo makes the diftance lm to 
be the 20th part of the Moon’s diameter, hevelius pro- 
ceeds, “ Quamobrem, cum diftantiee a nobis defignatte, 
(( paululum lint minores, idcirco et montes aliquantu- 
“ lum depreffiores inveniuntur, quam galil^eus aefti- 
“ mavit : neque non tamen illi terrenis noftris montibus,, 
“ quoad altitudinem, non folum sequiparari poffuntmeri- 
i( tiffimo ; fed et multo certe funt excelfiores, quam 
t{ noftri omnium maximi ; prout confeftim, ex adjedto 
“ diagrammate patebit.” He gives us then his calcula- 
tion according to German and Italian meafure ; and hav- 
ing found, in the manner above mentioned, the hypo-- 
thenufe mc, he adds: “ Semidiameter Lunae erit 1976 
“ odtav. part. Si igitur hsec a tota hypothenufa aufere- 
i( tur, reftabunt adhuc fex, hoc eft fex odtavce unius mil- 
“ liaris, vel tres quart® unius milliaris Germanici, five 
u tria 
