SIERRA CLUB BULLETIN, VOL. V. 



PLATE XXXII. 



Figure i. — Jointed Granite in Kuna Crest, Sierra Nevada. 



Figure 2. — Granite Boulder from which Spalls or Flakes have been Riven by the Heat 



OF Forest or Meadow Fires. 



JOINT STRUCTURE AND FIRE-SrALLING. 



