遵照某月某日来函指示，等。
1. in accordance with the instructions given (contained) in your favour of the 10th may
2. according to the directions contained in yours of the 6th may
3. according to the instructions given in your letter under date of the 10th of last month
4. in conformity with (to) your instructions of the l0th ult.
5. pursuant to your instructions of may 10