MORGAN. — THE PREFACE OF VITRUVIUS. 1 75 



stowal of these upon me, you continued to renew them on the rec- 

 ommendation of your sister. 



Owing to this favor I need have no fear of want to the end of my 

 life, and being thus laid under obligation I began to write this work 

 for you, because I saw that you have built and are now building exten- 

 sively, and that in future also you will take care that our public and 

 private buildings shall be worthy to go down to posterity by the side 

 of your other splendid achievements. I have drawn up definite rules 

 to enable you, by observing them, to have personal knowledge of the 

 quality both of existing buildings and of those which are yet to be con- 

 structed. For in the following books I have disclosed all the princi- 

 ples of the art. 



