Some subscribers to Math-Teach might be interested in a recent post "How To Write Good - ADDENDUM #2" [Hake (2013)].  The abstract reads:

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ABSTRACT: In response to "How to Write Good" [Hake (2013)] at <http://yhoo.it/15ouwJm>, Gene Glass wrote (paraphrasing): " 'The Elements of Style' [Strunk & White (1959, 2000)] at <http://bit.ly/13ZRsda> might be the undergrad's guide to good writing, but Jacques Barzun's (1975, 2001) 'Simple & Direct' at <http://amzn.to/10wv2lq> is surely the postgraduate textbook."

That "Simple & Direct" is also "Thorough and Scholarly" is manifest in its CONTENTS page:
Introduction
I. DICTION, or Which Words to Use
II. LINKING, or What to Put Next
III. TONE AND TUNE, or What Impression Will It Make
IV. MEANING, or What Do I Want to Say?
V. COMPOSITION, or How Does It Hang Together
VI. REVISION, or What Have I Actually Said?
Hints Toward Improving the Quoted Sentences
Index of Words, Topics, and Authors

For information on Barzun see e.g.:
(a) the Wikipedia entry at <http://bit.ly/Yxp4yw>;
(b) the eulogy by Rothstein (2012) at <http://nyti.ms/YIPAY1>;
(c) the eulogy by Epstein (2012) at <http://on.wsj.com/ZU4xoR>;
(d) the interview by Gathman (2000) at <http://bit.ly/17dQaje>;
(e) the biography by Murray (2011) at <http://amzn.to/120G3rS>;
(f) Barzun's (2002) book "A Stroll With William James" <http://amzn.to/19bReAB>, whom
     Barzun regarded as his "guide and mentor."
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To access the complete 18 kB post please click on <http://yhoo.it/11tJ4WK>.

Richard Hake, Emeritus Professor of Physics, Indiana University
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"[Jacques Barzun] wrote in a flawless and magisterial manner on a vast array of subjects: Darwin, Marx, Wagner, Berlioz, William James, French verse, English prose composition, university teaching, detective fiction, the state of intellectual life, and finally, published when he was 93, his magnum opus, 'From Dawn to Decadence: 500 Years of Western Cultural Life, 1500 to the Present.' None of this writing seemed motivated by his desire to advance his career; all of it derived from genuine intellectual passion."
  - Epstein (2012)

REFERENCES [URL's shortened by <http://bit.ly/> and accessed on 12 May 2013.]
Epstein, J. 2012. "Jacques Barzun: An Appreciation, Wall Street Journal, 26 Oct., online to subscribers at  <http://on.wsj.com/ZU4xoR> (non-subscribers can read the entire article by searching Google for "Jacques Barzun: An Appreciation."

Hake, R.R. 2013. "How To Write Good - ADDENDUM #2," online on the OPEN! Net-Gold archives at <http://yhoo.it/11tJ4WK>. Post of 11 May 2013 14:56:55-0700. The abstract and link to the complete post are being transmitted to several discussion lists and are on my blog "Hake'sEdStuff" at <http://bit.ly/10OgckH> with a provision for comments.