After 20th. things go along nicely in the lower numbers. At 28th. things get ragged again. Tricesimo is 30th. It is also necessary to remember that fact when faced with bapt. Presumably 8ber , 9ber and 10ber are also acceptable renderings of months.
Problems arise with abbreviations.
Ianii can be Iunii . In the latter case reading the before and after entries can sometimes sort them out, remembering that Ianii 1643 is one month later than Dec 1643 . Aprilis and Augustus may look alike as Agx and Axg , but can usually be sorted out by before and after readings and the position of the downstroke. When small case Roman numerals are used they, too, come in variations. The use of j for the end of the numeral is very helpful, and even the worst of writers usually managed to dot all his i and j forms, so one could count dots even if the squiggles didn't offer much aid.