
          Washington D.C. May 13, 1856

 Dear Dr:

 I was glad to get a line from you this afternoon
 and to find that I was not forgotten.

 It is desirable that the amount
 you have expended in the drawings and that
 which will be required to complete them, should
 be called for without delay as our money
 is nearly all gone and it is doubtful whether 
 we shall get any more from this Congress. You
 had better send in the bill for the necessary drawings,
 at once and it will be paid. You may enclose
 it to me if you please. The printing of Whipple's
 Report is progressing, but the volume will not
 be out for 4 or 5 months, at least. Williamson's,
 including my Report, will not go to press until
 Fall or winter, but all the illustrations should
 be in hand as soon as possible. You will
 therefore have several months yet to complete
 your descriptions.

 I do not know exactly
        