This section same as slide #201, but with xNicol; other was in ordinary light.

Crumb structure of Ah in profile of slide #140, at Dunlap Observatory at Richmond Hill woodlot.

Blocky structure in the Bt of the profile in slide #140; n.b. the ped, the pores and the argillaceous coating on the ped

Iron concretions (Bfcc) in a Douglas fir soil on Vancouver Island

Blocky, angular structure in the B of Slide #140 at Dunlap Observatory, Richmond Hill.

Winter and snow cover at the Dunlap Observatory, Richmond Hill, the location of profile in slide #140

Same location as slide #207, but in March as snow is melting n.b. the litter layer of the forest floor.

View of same location as slides # 207 and 208 showing litter after snow has gone, n.b. the curling of the leaves and the exposure of of the surface of the Ah.

Nodules of Comptonia peregrina N-fixing

Mycelium of Phytophthora cinnamomi in W. Australia