210 PHILOSOPHICAL TRANSACTIONS. [aNNO I667, 



month happens. But this is more easily obtained by finding on what day of the 

 week the first of March happens for ever, according to such rules and verses as 

 I have elsewhere published. 



In brief thus : — To the number 1 add the year of our Lord, suppose 1669, 

 and its even fourth part, neglecting what remains, if any, as 417 ; the sum 2088 

 divide by 7, noting the remainder, which shows the number of the day of the 

 week, accounting Sunday first. If O remain the first of March falls on a Sa- 

 turday. In this example there remains 2, showing the first of March to fall 

 on a Monday. If it were required To perfonn this for years preceding our 

 Saviour's nativity, then take this rule : To the year add its even fourth part, the 

 sum divide by 7 ; the remainder shows the day of the week, accounting Sunday 

 first, Saturday second, and so backwards. 



To find what day of the month in the first week of each month happens to 

 be on the same day of the week as the first of March. Use the following 

 verses, in which the 12 words relate to the 12 months of the year, accounting 

 March the first : 



Ask endless comfort, God enough bestows. 

 From divine axioms faith confirmed grows. 



The alphabetical number of the first letter of the word, proper to the month 

 proposed, is the answer : 



For example. — If the month were April, the word proper thereto is endless, 

 and E is the fifth letter in the alphabet. Therefore conclude, that the first 

 of March and iifth of April do for ever happen on the same day of the 

 week. 



To find on what day of the week the first day of each month happens. Suppos- 

 ing the first of March known, it might be reckoned from the former problem ; 

 but the following verse, beginning with March as the former, is more ready 

 for the purpose : 



A dreadful fire, beholders daily gaze. 

 Chastised England. Ah cruel fatal blaze ! 



Explication. — In the year 1669, the first of March is Monday; I would 

 know on what day of the week the first of October happens. The word pro- 

 per to the month is England ; then count alphabetically to E, viz. A Monday, 

 B Tuesday, C Wednesday, D Thursday, E Friday, which is the day sought. 

 Whence conclude, that the 1st, 8th, 15th, 22d, 29th days of October are 

 all Fridays. Thence it is easy to reckon on what day of the week any day 

 of that month happened^ and so for all other months. 



