Alichigiin Geolotrical mikI 

 Biolotfical Survc.\ 



Piihliratioii 20; Hiology 4. 

 Plate XVI 



A, BKACH POND TN THK COURSE OF MASON'S CREEK. 



p -MAKsii H(>i;i)i:i!i.\(; masons (•ki:i;k isiwiion it:.') on i.aki; 



HKACH 



SI ri;i{ioi{ 



