S. Bureau of Standards; Published by W. M. Welch Manufacturing Company, Chicago.

B. A Reproduction of One Unit of the Chart of the Atonns, and the Key Used fo Interpret All of the Graphic Illustrations on 52A.

The right side is a reproduction, in one color only, of the unit which represents the element Potassium. The left side appears as a key at the lower right of each chart.

Chapter 5 GENEOLOGY AND GENETICS CHARTS

eneology and Genetics Charts are known chiefly as means for tracing ancestors. Synonyms for geneology and genetics charts are: pedigree charts, genealogical charts, ancestral charts.

SAMPLE PCOieRCE CHART SHOWINO THE MANNER OF CONSTRUCTION, AND THE USE OF STANDARD AND SPECIAL SYMBOLS.

iCir6 6

C^

_ _ if i * 6' 6irik' 6 d ti iikd^ x

K tXPLAWATKIII Of ITMIOLI

D'MQle,- O'^e""!!*; 0'3tT\n\ln>owi\., A-StiU-biiiW or M>scoima^e,X"CKi\irtT\-- numbtr oi\4 sex -unVnown; OO'TwmSj

Roman SnuTT's v> \h». U^V mditoX*. (^mtrotionv l\rQkM ^^urti \oca\e miwidMois, (\V«u4 ffl.T i» tt\« >\ovit\^ mon m \V«. >*iir4 qtntTo\ion who mornti >u^ countx).

31« ^oWtwnnfl Vttttr*, p\ate<i in or anMnd W»t i»dr(\4ua\') vtdv^rti S'^mbd), or* i\oi\4or4. ^or ttrtQ\r\ \roi\» R. a^toVvolit; B, blm4i ttdtaS. E. epi>«^ic, F, VtiWemmitdj I, \T»ant, Mj[m'\qr(i\ritou^;N,'norwa\ nv rtStrnvc* \t XmM Mtv4tr tQt\v4«ro.\xOT»j Nt, T»wrdl\t; P. pQr<i\x\>C; ^T, ^txuaAA)^ \mmort^, S.VtThMiC/ X tubtrtu\ouV H wanitrtr.

■ 9* 5«cct%iSu\ \to4«ri \n pa)M^c^■ O© • Ei\Ta tt\>onD on rM^W hani. Ul'H\<)hV\^ ^«^.t^^Su\ ou^Hor. L.s "VjIRt or no oMWi^ in \>)tr«r\^ iS<or1«,. ■#'^ui)Cr\or m volo\ »nuvt. B© » Mtdmrrv oWoinmenV. m MOtoV wuvc.