APPENDIX. 115 



writes factis, but there is not, as far as I know, any MS. 

 authority for it. With respect to the author of it, the 

 Bodleian MS., in a coeval rubric, states the calendar to 

 have been written a fratre Rogero Bacon ; while the 

 Cotton MS., not having any original title, is ascribed to 

 Roger Bacon, in a hand of the 17th century : both of the 

 MSS. belong to the 14th century. In the Harleian 

 collection (No. 941) is a MS. on the length of the days 

 throughout the year, stated to have been made at Oxyn- 

 forde be the new kalendere and proved in all the univer- 

 sity : this new kalendere may possibly refer to Roger 

 Bacon's ; but there are not sufficient data to enable us to 

 attain an approach to certainty. 



The calendar of John Somers, of Oxford, written in 

 1380, was one of the most popular of the time: there is 

 generally appended to it, Tabula docens algorismum 

 legere, cujus utilitas est in brevi satis spatio numerum 

 magnum comprehendere. Et quia numeri in kalendario 

 positi vix excedunt sexaginta, ultra illam summam non 

 est protensa* Several English translations of this tract 

 are among the Ashmolean MSS. 



We have likewise in MS. Almanack Profacii Judei, 

 which is very ancient. Walter de Elvendene wrote a 

 calendar in 1327,f and Nicholas de Lynna published 

 another in 13864 Sometimes these calendars are found 

 in rolls. 



In the library at Lambeth Palace is a very curious 

 calendar in the English language, written in 1460 ; at the 

 end is a table of eclipses from 1460 to 1481 ; but a very 

 perfect volvelle is most worthy of notice, because those 

 instruments are generally found imperfect. In the Cot- 

 tonian collection is another English calendar, written about 



* MS. Bib. Cott. Mus. Brit. Vespas. E. vii. f. 4. 

 t MS. Sloan. Mus. Brit. 286. J MS. Ashm. Oxon. 5. 



