(244) 
He (Cajfmi) pretends to evidence by his Obfervations'; made 
at the fame time-at Benonia , that, the fame day and hour, thofe 
Spots were very large, neer one another , in the midft of the 
Disk, the Oriental bigger than the Occidental (as appears by 
Fig. P, which is that of the fecond Face of Mars.) 1 
1 2. Befides,he declares,that thofe Afironomers were too hafty, 
in determining, after 5- or. 6 Obfervations only , in how much 
time Mars fini ill’s his Revolution; and denies it to be perform’d 
in 13 hours: adding, that, though Himfelf had obferv’d for a 
much longer time, than they ; yet he durft not for a great while 
define, Whether Mars made but me Turn in 24 hours 40 minuts 
or two ; and that all, that he could , for a long time affirm, was 
onelythis, that after 24 b. 40 m. this Planet appear’d in the 
fame manner he did before. 
13. But fince thofe firft Obfervations , He affirms to have 
found caufe to determine , that the Period of this Conversion 
is made in the faid fpace of 24 h + 4©m; and not oftnerthan 
once within that time ; Alledging for proof; 
1. That, whereas Febr.6. (ft.n.) he faw the Spots of the firft 
Face of Mars, moving from eleven of the Clock in the night, 
until break of day, they appear’d not afterwards in the E- 
vening after the rifing of that Planet(witnefs feveral intelligent 
perfons, which he names,that were prefent at the Obfervations) 
Whence he infers, that after 12 hours and 20 minuts, the fame 
Spots did not come about ; fince that the fame, which in the 
morning were feen in the middle, upon the rifing of Mars s after 
13 or 14 hours, might have appear'd neer the Occidental 
Limb. But , becaufe he might be impofed upon by Vapors, 
whilft Mars was yet fo neer the Horizon, he gives this other de- 
termination, vid. 
2. Whereas he faw the firft Face of Mars the 6 of February 
at i i of the clock of the night following ; he did not fee the 
fame after 1 8 daies at the fame hour ; as he ought to have done, 
if the Period were abfolved in the /pace of 1 2 h, 20 m. 
3. Again, whereas he faw Febr. 24. in the Evening, the other 
Faceo [Mars, he could not fee 'the fame, the 13. and iy. day 
of March, to' wit after 17 and 19 days; as he fliould have done, 
if the Revolution were made in the newly mention’d time. 
4 “ Again* whereas the 27, of March in the Evening he faw 
' the 
