Cotton morphology and mechanism of fibre tension was assessed by making use light microscopy. In essence, a solution prepared consisting ZnCl2 (100 g), ki (32 water (34 ml) I2(TILL SATURETION). This used asa swelling agent for cotton during microscopic examination. It found that the primary wall takes spiral shape, spherical or combination both whereas secondary appears as beads. The shape size...

There are nonrepresentable relation algebras generated by their functional elements. This solves a problem posed many years ago. The number of generating functional elements can be as low as 2. This leaves open the problem whether there is a nonrepresentable relation algebra generated by a single functional element.

Booth and his co-authors have shown in [2], that many new approaches to theory revision (with fixed K) can be represented by two relations, < and , where < is the usual ranked relation, and is a sub-relation of < . They have, however, left open a characterization of the infinite case, which we treat here.