REF ID:A99B79 

THE UNIVERSITY OF 

PENNSYLVANIA CLUB 

OF NEW YORK CITY 

Mar. 16th, 1936 

Dear Friedman.a 

Your caru arrived this morning. I am d~lighted that Barbara 'shows signs of improvement; and shall not fail to inform Dr. ~ornHeim, who, l am sure, will be much pleased. By the ~ay, she will 

be i~ r:ashington at the r1illard on the 25th for a Physiological (?) 

congress. You will, however, be away them.. ~ hope you h~ve a fine 

trip.' Please let me know without delay whether you will be in Washington 

on the 3rd of April. I should like to see you then and return the books. 

I am ~oming through on my way back onApril l~th, and may stop over for 

the d~y. A railroad trip always dulls my brain, such as it is, especially if, l have to get up early in the morning; but perhaps the difference 

won't' be noticeable. ~ 

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I frogress? Well, a lot of labor expended so far. I made the mistake pr beginning with 18470 instead of 13040, which is a cleaner book 

in evf rY way. I have alphabetized all the pages of 18470, but many cannot b' done. I have spent as much as half an hour on sorne pages - and 

o£ten

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to write a question-mark at the end. I have not studied the results.yet, except for glances - of wnich a further mention anon. 

*eantime l have gone over to doing the same job on 130~0. I have 

done i•rn of the 19t:: pages. There a.re almost no missing blocks or mix-ups 

here, ,and I am going to put some study on these before I go further. 

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your letter of Feb 20th you sug~est 

that there is a limited number of rearrangements 

that there is system behind the rearra.nGements 

that 18~70 and 130~0 were produced by cipher tables from an 

alphabetical code - XX and YY. (There never was a difference 

of opinion concerning the othercodes of either family) 

that the order and system you see would be pointless if your 

theory were not correct. 

1), I am convinced, is an error. I have arranged my 120 pages of 

13040, and found t1re repetitions - i. e. 118 different arrangements in 

120 pa1ges. 

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21) is just as certainly correct. I remembered your letter as saying "there~is a system behind the rearrangements." I had intended to cross 

out "a,'and say l would f)Ut it that way. but I see you have already done 

that. There are very striking things. As I said, ~ have not yet really 

begun ~o dig, but in one case I predicted the order on an entire page. ~hethef we have one svstem or several - and what, I e.m, of course, not 

yet prf pared to say. 

4) in the case of' the Germans, v•ould not trouble me much. They use 

system•when it is a positive detriment. Look at the systematic rearrangement 

or the l XX pages in making 18470 (this does not affect the question of whether 

tables

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were used). Look at tne humble Dreinummerhef't. Unless I can see 

a p ositive advantage in a. German s·•stem lOf course I admit that the saving 

of theiprinting of a disarranged code would be one} I prefer to think that 

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@'pproved for Release by NSA on 07-30-2014 pursuantto E.O. 1352a. 

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REF ID : A9 9·87 9 

THE UNIVERSITY OF 

PENNSYLVANIA CLUB 

OF NEW YORK CITY 

U}l!'~..!S0.

~ 

6USXeBelX. 

we hare what your friends in the Telepsycholo~ical " Department of Duke Universi:ty call "the orderly avoidance of order." 

But that, or course, remr.lins to be seen, and that is v:h,. .a. liave 

skippbd your 5). - I see I h~ve ne~lected to say that signs of system are 

also ~?parent in 1~470 even \'1ithout detailed study. My ma.in reli11nce 

there 1 l'!ill hav'-' to be the numerals, which I hA.ve now proved (I had only thoti~ht so ., you kno,,·:) come alph'l.betically 5th and 10th on each page. 

I hav~ revised my notion of the stops, and have been amazed to find how compa~atively few were used. I doubt whether a stop ending in 1 and one ennin~ in 2 ever really occur on the same page - one is used in one alphabetic\11 posi"t;ion on even-numbereo pages, and the other in a difi'erent 

s.lphapetica.l position on the odd-nu:nbered pages - more oblations to l:1ystem. 

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I must eeturn to mv mutton. Greetin~s to you and your family. Don'tLfor~et to let me know promptly whether you will be in uashington on 

th9 arternoou or April 3rd lFriday). 

~ordia.lly 

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