HOWIETOUN. 



193 



and this washes everything dirt, and any occasional fry, eels, etc. 

 into the r~>, .. 



bottom of the 



7~"i' 'j f 



apron of the 

 dam, thus 

 preserving 

 the segrega- 

 tion of the fry 

 in the 20-feet 

 ponds (Fig. 

 142). In the 

 larger ponds 

 any strangers 

 are instantly 

 devoured, 

 and if not, 

 they would 

 be discovered _^ 

 with ease and ^ 

 certainty at 

 the next in- 

 spection. 



The intake 

 was complet- 

 ed, and the 

 water let 

 through the 

 new sluice 

 on 3d April 

 1876. 



In the 

 meantime I 

 had increased 

 the 20-feet 

 plank ponds 

 to four, three 



