Page 53 Footnote marker added for "See Johnston's Elements, page 41."
Page 55 ? added after "in their composition" in footer
Page 74 Removed second "the" in "is the the foundation of Agricultural Geology."
Page 142 pigstye standardised to pig-stye
Page 144 plough standardised to plow
Pages 145, 211 subsoil plow standardised to sub-soil plow [Note that in line with the more common usage in this work, the phrases sub-soil plow and sub-soiling have retained their hyphens]
Page 148 Removed second n in mannures
Page 152 postash corrected to potash
Page 157 suplying corrected to supplying
Page 167 carbonia corrected to carbonic