He therefore wrote Sermons in Stone, which advocates Hugh Miller's view that the "days" of Genesis were not twenty-four hour days but geological ages.
Then he obtained a copy of Hugh Miller's Old Red Sandstone (published in 1841), and he began systematically collecting with hammer and chisel the fossils from the Caithness flags.
In 1858 he edited an edition of Hugh Miller's Cruise of the "Betsey." He was the author of numerous essays on the geology of the Malvern country, notably of a paper "On the passage-beds from the Upper Silurian rocks into the Lower Old Red Sandstone at Ledbury" (Quart. Journ. Geol. Soc. 1860).
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In 1853, after reading Charles Darwin's Voyage of the Beagle and Hugh Miller's The Footprints of the Creator, Gulick presented his paper, "The Distribution of Plants and Animals", to the Punahou School Debating Society.