MEMOIRS UN IV. CALIF., VOL. 1, NO. 2 



UMERUIA.MI PLATE 22 



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ii;. 1. A pool of asphalt \vliicli lias come to the surface through a small pipe or channel. The tar has 

 mixed with the soil, so that its boundaries are not readily seen. 



Fig. 2. A tar seep coming up through the soil where the ground has been largely occupied by grass and 

 weeds. Puddles and ponds of tar thus formed trap many small animals. 



