636 KUNKEL: INFLUENCE OF STARCH, PEPTONE, AND SUGARS ON 
TABLE VII 
THE INFLUENCE OF PEPTONE ON THE TOXICITY OF FERRIC NITRATE IN STARCH MEDIA 
Growth after 
Medium ees 
.0067 molar solution of ferric nitrate + 5% starch ...........206.0500s . 
0067 ‘ i oes pase “+ 1% peptone ...... to) 
0067. “* 3 caus napa Saha # 2% Ce tlle ie 
0067 “ ‘s ‘e ““ ‘se + “ = a 3% Bae SRE a 
0067 ts ‘e “ “e “ + “ s + 4% ph ore tae e a + 
0067“ se ener “ baiiess “6 + 5% fas Sather i 
0067.“ ee Gis gee ES a RS aa os 
.0067 ‘6 ‘ ‘e “ : - se se a 4% Peat ge ae + 
0067“ “ 6s ‘“ en “ 4 8% yASE SE ON Bere! ct 
.0067 ‘a ‘sé “ ‘“s — “ ni a 9% ay Pa gig! Saag + 
TABLE vil shows the degree to which peptone counteracts the 
toxicity of ferric nitrate in starch media. When only 1 per cent 
of peptone was added to this medium none of the spores germi- 
nated; when 2 per cent of peptone was added the spores germinated 
and produced microscopic mycelia, but when 4 per cent of peptone 
was added vigorous growth was obtained. 
TABLE VIII 
THE TOXICITY OF VARIOUS SALTS IN SOME COMMON MEDIA 
Toxic concentration Salt Medium 
-156 molar Datiim nitrate ise starch 
-067 - si Tats Whip pipes taletees 5 6 phe peptone 
167 neg 2 ok pale eres oo as glucose 
167 big te iaieee pee oe Gees fructose 
067 fe i Reh ature es eee galactose 
cia ae Ug fe ee Sass s criss arc 
ra) a (5 eesti e ce Veniary Cex Peles Riek peptone 
0070 = ** aS Ria RIO eee gt glucose 
MOG: a. ae Ries SPR mt epee fructose 
ourg: “ EOS Ee pen, oe galactose 
00067 ferric SI als Re eRe Nt ch 
.00670 =“ . preiie CR Sa npn peptone 
SOs 20 . ONES AC es a SI ee ie gluc 
00070 =“ - Seis aces Urine Serna fructose 
00040 “ ey cere pe ney galactose 
05 s urea o pO GS tare 
-20 ss . PEN ig gra he ge ee ciie ga peptone 
025 We ammonium tartrate........... tar 
-027 . " s petra ae peptone 
As shown by the above table, barium nitrate is more toxic im 
peptone and galactose than in the other media. Aluminum nitrate 
