34 Report on the projected Survey of the State of Maryland. 



make this information applicable to useful purposes and subservi- 

 ent to the various interests of their fellow citizens. Opportunities 

 have also been afforded of observing many objects of purely scien- 

 tific interest ; but a distinct account in the body of the report did 

 not seem to be required. They have, however, carefully collected 

 such articles as might serve to illustrate the facts that have been 

 mentioned ; or to which it might be desirable to refer, as specimens 

 of the geological constitution and mineral resources of the different 

 sections of the State. The disposal of these is left to your excel- 

 lency. 



They beg leave further, in conclusion of this part of their report, to 

 acknowledge to your excellency, the great advantage which they 

 have themselves derived fi-om the assistance of their fellow citizen, 

 Philip Thomas Tyson, of Baltimore, whose extensive practical in- 

 formation and whose familiar acquaintance with the sciences connect- 

 ed with the present examination, have rendered his services extreme- 

 ly valuable. They entertain a hope that corresponding advan- 

 tages have resulted to the public interest ; as without the assistance 

 so zealously and devotedly given by this gentleman, it would not have 

 been in their power to have extended their researches over so wide 

 a field of investigation, nor with the same satisfactory results, which 

 they flatter themselves they have in a measure obtained. 



Submitting what has been already said in relation to the first divis- 

 ion of their duties, the undersigned will only add, with reference to 

 the second, a kw words explanatory of the mode of execution, and 

 of the map which they have the honor herewith to present. 



A catalogue, which they have been careful to arrange and pre- 

 pare, and which will be found to accompany this report, exhibits the 

 sources from which this information was drawn. Where materials 

 were so scarce, it is hardly to be expected that there should be 

 much clashing or contradiction, yet the full allowance of difference 

 and incertitude which must always attend independent observations, 

 made arbitrarily and without reference to an unit of any sort, was 

 found to attach to this work also. In having reconciled as far as they 

 were able these discrepancies, and in stating the elements of exam- 

 ination and proof, they conceive there is no room for expressing an 

 opinion as to the authority of any, it is left for every reader to make 

 up his own judgment. Only they must be permitted to add, that 

 their labor would have been longer and more wearisome without the 

 assistance furnished by the work and public spirit of a citizen, whose 



