July 24, 1974 Dr. Willie18 L. Brown Vies President und Director of Reaeerch Pianear Hi-Bred Intemetionel, Inc. 1206 Mulberry Street Des Moines, Iowa !503OS Deer Bill, My sincere o pologies for this delay in reporting to you on my efforts to comply with your rsquest thet I cOlePwnt on the rece relations given in the tsenuscript (Brown and Gao&sen) thet arrived here sevsn weeks rgo. To give you a conprehensive reply requires intimete knowledge on ay pert of knob conetitutions of individuelly nemsd reces that at8 consider4 in the various xeise reports end that era included in your text and reletedly grouped in the figures. Thfe I could handle readily for the U.S., Mexico, and Central America races, because I have spent armths in en effort to mske reletionships evident. Although I am oriented with rsgerd to introductions end to migration peths for vise of the Ceribbsen Islands, Venasutele; end Restem and Western South America, I hsve not brought this information to beer on individual reces in these areas with a few exceptions of those recsm whose knob cmporitims ere so striking es to readily revert1 origins of their gem plesms. Examplsrr of them races are Pisinkslle, Perola, Cenguil, Are&to, Pire, Chococeflo, along with a few others. I hed hoped that 3lmsenschei.n would meke the integrations for Caribbean end South Asasricen reces es these were mede for reces in other perts of the &rices. `The msens end ~r#thods for doing this were thoroughly discussed with hix during our long meting in Mexico City in 1972, (The Februery 1973 meeting was cencellsd just tsn hmrs before my schedulad flight to Mexico City! That's a story end I es~ still engry.) To dete, his contributions are incomplete, inadequate, snd in 80188 respects uneccepteble. Because of this, and bsceuse I do not expect eny further contribution frors his+ I ea obliged to underteke s- of the basic enelyses myself. This requires working with his rew dsta, most of which 1 hmi receivad earlier, end remaking a number of knob distribution maps because en uncoafortabls number of those that he furnished to me in p~li and to Wellhausen later, unchenged, wers incomplete or so ineccurate as to be deceptive. Again, on criticel mqm, a race nems msst be placed adjacent to each recorded item or adjacent to those criticelly reveeling ones on other maps. Cans ider Lng the number of knob types recorded and the nmber of recea exeminsd, this is a forlaid- eble task for xs, which I cosssenced with the South tiricen material of Blunmmchein only after receiving your nenwcript. Recauss your muscript considers the content of the report of Grobmn et al., I found it necessary to tabulate Crobrsen's statements on knob coristitutions of races he discusses in this report. This, too, wes a disconcerting task 88 his node of recording knob locetions, sises, end n&ers was sloppy end in sane Dr. William L. Brown -2- July 24, 1974 instances obviously ineccurete. Nevarthelese, in soem instances, I CM read the trends peering through these sluppy recordingr~ end plcascntly, tame of them fit nicely with axpectetfons based on iumwledge of knob constitutions of races located in edjacent countries end else on his eer photogrephs which, in meny instcnccs, arc suppmtivc of my conjectures. Right uow I em still ismsrsed in the intrgretive processes and on all fronts. It will take ms scms tiara to eurfcce. Thus, et this tims I do feel that I should not send you o short, incomplete report. Neither do I feel confi- dent that en abbrevietod report would suffice, Swmeries were sent to you early in February 1973 of (1) paths of migretion of selected knob collplcxcs, (2) the basic knob composition of TuxpcYlo, its migr~tim paths and secsndsry germplesa wdifications that occurred either after introductions into new locations or during migrations. Also (3) severe1 other sumstics, including the projeettd origins of the Venezuolen ceqlex end the Meyen meize origins and mtgretions, were Included. I Ed not sum just how effective such susmeries could be for you or for others. In them, ncvcrthcless, I trisd to give direct references to the obvious evidence appearing on knob distributions mps previously supplied by I.&to, a set of which yo;l racaivcd. Possibly this stcchod is not sufficiently cxphatic or it rings too few bells. Believing thio rosy be the case) I now hcsitete to aeke brief cusmcnts on race associations that ere projected in your text end f ij$u;tc8. Rest esnured, howcvor, that 1 cozsidcr mst 02 them on which I am conqpizrmt to coummt to ba accurately related or to approach ad+.~~y given the knowledge now eveileble. I should trnti~l~, at lez~~c, c;iat 1 COUU aid portiilal~r ini'or~~;Mn QI~ tilt?. gcrmplasm colsposition and the influence of the races S&l-Tel, Iiarinoso de Who, Chqalote, R&mtador, Zapalocti, P~~pitilia, Eolita, and sow others. Yctu may WUh to kilti.-: of this c-~s:i~tualfy. Also, I iim couFi&mt ~ha; wti knos sowthing of the relationships to other rams of some chat appear in your Table 1. LGX4lcepl@S are x Melz Dulce, the &more races Dulcillo, Crfstfline, Blando, and Omve%o, and the waste South Amzricen races Uchime, Grllin8, Cholito, Rabo de Zorro, Jore, and ~Ch@,o&ro $8 we11 as a f&w others in thcl list. Xncorporeted in suy thinking and in a general way are the da;a collxced by Reto during the pmt year. He examined 44 collections of Teosinte (a total of 253 plents) dsrived from the stetes of Mexico, Gucrrero, Michoecan, en