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

(12)關(guān)于詳情，下次敘述……

1. I will write you particulars in my next.

2. Particulars will be related in the following.

3. I will relate further details in the following.

4. I will inform you more fully in my next.

5. I will go (enter) into further details in my next.