The phrase "and demonstrative of a" is correct and usable in written English.
It can be used when you want to indicate that something serves as a demonstration or evidence of a particular quality or characteristic.
Example: "The results of the study are and demonstrative of a significant correlation between the two variables."
Alternatives: "and indicative of a" or "and representative of a".
Critics have been surprisingly spirited: the Daily Telegraph called the court's foundation a "perilous" and demonstrative of "Labour's disdain for our country's constitution", while even Lord Neuberger, the new master of the rolls, accused the government of making "what appears to have been a last-minute decision over a glass of whisky".
A heritage review of the bridges of County Offaly in 2005 described Banagher Bridge as of national heritage significance, of high architectural merit and demonstrative of mid-19th century construction work by a government body.
"We see the fellowship as a way to give our audiences direct contact with somebody from a culture they might know little about, somebody whose films are particularly special and demonstrative of that culture".
But neat, certainly, and demonstrative of the new Plex plugin system.
The new features are part of Salesforce.com Service Cloud and demonstrative of what executives say is the company's plan to "double down" on mobile in 2013.
One thing that girls might find very bold and demonstrative of good flirting skills is this: when you're walking with her, brush your arm against hers.
Turning to Paul Le Guen was bold, imaginative and seemingly unrealistic but demonstrative of a degree of audacity that Murray has often matched with persuasiveness to great effect.
If the minimum value for the trait increases along with the average and the maximum, then this is strongly supportive (but not conclusively demonstrative) of a driven trend (Fig. 8).
With one foot out of the infinite freedom and space of computer programming, Quayola's first step into physical art is as demonstrative of an untouched medium's inherent potential as the sculpted forms which embody this series.
