Ah of the profile in slide # 223; n.b. granular structure and roots; a typical mull.

Root in the Bt of gray-brown luvisol profile, slide #223.

Root channel just below Bt, in Ck; in profile of gray-brown luvisol slide # 222 & 223

Same profile as slide # 222, but from different angle; gray-brown luvisol

Profile of an orthic gray brown luvisol; n.b. light colour area to right in Ah is due to dry soil; Located at Dunlap Observatory woodlot Richmond Hill; same profile as slide #223.

Close-up of the basal till in slide #220, showing the "lenses" or lines of compaction in the till.

Profile in a basal till (sandy loam) under mixed boreal forest; n.b. compaction lines in till; location Cairo Twp. in Plonski Forest near Swastika

Close-up of the L, H,, Ah, Bm horizons in a Dystric Brunisol at Dorset.

Algal growth on soil surface which is fixing Nitrogen

Microsection of the cortical cells of an Alnus nodule to show the vesicles (stained red) within the cell which are thought to be the site of Nitrogen fixation