220 



REPORT — 1879. 



round our coasts, excepting the low water of a few equinoctial springs at 

 two or three points, such as in the River Severn near to the mouth of the 

 Avon, and in the Bay of St. Malo on the coast of France. 



In conclusion, the Committee beg to add, that the 10?. granted to it 

 has been expended ; in expenses, in connection with levelling to ascertain 

 the exact relative position of the Ordnance datum of Great Britain, and 

 in correspondence and in other matters in the preparation of the list of 

 local datum-marks appended hereto. 



Appendix. — List of various Local Datum Marks in use in the British 

 Isles, with difference of each from the Ordnance Survey Datum Level. 



