560 APPENDIX. 



The bays, harbours, &c., mil be on the scale of four inches to the 

 mile, but the general chart you will plot on the scale of two inches, 

 which will include all distant points. 



The officers will be particular in sketching in the shores, and 

 tracing the topography. It is expected that the soundings will be 

 full and no part omitted, and that every part of the harbours that 

 are surveyed will be attended to in this respect, as few things 

 give so unsightly an appearance to a survey as an irregularity of 

 soundings. 



In order, therefore, to liave a full view of your work done, it is 

 necessary that it should be plotted immediately, and the work kept up 

 daily. 



The number of officers under your command will leave no excuse 

 why it should not be done, and it will be expected by me that this 

 part of your duty will be attended to with the greatest attention. 



You will endeavour to obtain all the information that may lay in 

 your power relative to the geological formation, and capabilities of the 

 soil for agriculture, near and about the parts surveyed ; also all the 

 minerals ; and water-courses or brooks affording water for siiipping, 

 will be particularly noticed. 



You will likewise pay great attention to the tides, their height and 

 fall, set of currents, and the time of high and low water at full and 

 change. This may be done in a few hours by marking a staff stuck 

 in the water, a few feet from the shore, and an hour or two before 

 high and low water, noting the time by the watch at the same time, 

 and again when the water rises to the same point : the mean will 

 give you the high and low water on that day, which, applied to the 

 age of the moon, will give it on full and change. 



I am desirous also that your dredge should be much used at all 

 anchorages : there are many times when it can be done successfully 

 in deep water, and the results would be more rare and valuable. 



As respects your astronomical observations, those by the north star 

 I should much prefer to the sun for your latitude, and the time by 

 a star I consider fully as good as that by the sun. After a little 

 practice, observations on stars with the artificial horizon will be found 

 easy and convenient, interfering but little with .your surveying duties 

 during the day. 



The accuracy of the survey depends so much on these observations, 

 that a few hours taken from sleep will be amply repaid. 



Let all your work bear date, scale, and name. The names of 



