When you have got your emaciated Philomath, I desire that his triangles, rhomboids, etc., may not keep you one moment out of the good company you would otherwise be in.  Swallow all your learning in the morning, but digest it in company in the evenings.  The reading of ten new characters is more your business now, than the reading of twenty old books; showish and shining people always get the better of all others, though ever so solid.  If you would be a great man in the world when you are old, shine and be showish in it while you are young, know everybody, and endeavor to please everybody, I mean exteriorly; for fundamentally it is impossible.  Try to engage the heart of every woman, and the affections of almost every man you meet with.  Madame Monconseil assures me that you are most surprisingly improved in your air, manners, and address:  go on, my dear child, and never think that you are come to a sufficient degree of perfection; ‘Nil actum reputans, si quid superesset agendum’; and in those shining parts of the character of a gentleman, there is always something remaining to be acquired.  Modes and manners vary in different places, and at different times; you must keep pace with them, know them, and adopt them, wherever you find them.  The great usage of the world, the knowledge of characters, the brillant dun ‘galant homme,’ is all that you now want.  Study Marcel and the ‘beau monde’ with great application, but read Homer and Horace only when you have nothing else to do.  Pray who is ‘la belle Madame de Case’, whom I know you frequent?  I like the epithet given her very well:  if she deserves it, she deserves your attention too.  A man of fashion should be gallant to a fine woman, though he does not make love to her, or may be otherwise engaged.  On ’lui doit des politesses, on fait l’eloge de ses charmes, et il n’en est ni plus ni moins pour cela’:  it pleases, it flatters; you get their good word, and you lose nothing by it.  These ‘gentillesses’ should be accompanied, as indeed everything else should, with an air:  ’un air, un ton de douceur et de politesse’.  Les graces must be of the party, or it will never do; and they are so easily had, that it is astonishing to me that everybody has them not; they are sooner gained than any woman of common reputation and decency.  Pursue them but with care and attention, and you are sure to enjoy them at last:  without them, I am sure, you will never enjoy anybody else.  You observe, truly, that Mr.------is gauche; it is to be hoped that will mend with keeping company; and is yet pardonable in him, as just come from school.  But reflect what you would think of a man, who had been any time in the world, and yet should be so awkward.  For God’s sake, therefore, now think of nothing but shining, and even distinguishing yourself in the most polite courts, by your air, your address, your manners, your politeness, your ‘douceur’, your graces.  With those advantages (and not without them) take my word for it, you will get the better of all rivals, in business as well as in ‘ruelles’.  Adieu.  Send me your patterns, by the next post, and also your instructions to Grevenkop about the seal, which you seem to have forgotten.