TOXICITY OF VARIOUS NITRATES TO MONILIA SITOPHILA 635 
As shown by TABLE V, ferric nitrate at a concentration of 
0.0067 molar, does not hinder the growth of Monilia in peptone 
media. In glucose media it inhibits the germination of the 
spores, when present at a concentration of 0.0007 molar. The 
small amount of mycelium obtained in fructose media containing 
ferric nitrate at a concentration of 0.0007 molar indicates that 
this is near its limit concentration in this medium. It is more 
toxic in galactose than in fructose media,—but is much less toxic 
in peptone than in any of the other media used. 
TABLE VI 
THE TOXICITY OF UREA NITRATE AND AMMONIUM NITRATE IN PEPTONE MEDIA 
Medium Growth after 11 days 
-200 molar solution of urea nitrate + 5% peptone........ sa 
.133 ‘ec “ce “ +s se + ‘ss hcg Ti ARE toe rE + 
067“ “ ot eee “ + * ini ek Sr ge 
.033 ‘“ ‘s ea “s + * pater Slit Sl Gee + 
027 ‘s Rae “6 + * MS Palbees wears + 
.020 “a “a “aos 4s + * By crating mer a, + 
Wig oe ee as AG PE ee get os + 
007 “ a“ ere 4s + “* peers tee + 
i ‘* “ ammonium tartrate + “ ety ees ig 
.067 4 “ “ “se ws + * SLi ay eeataetee 5 ce) 
060. «(* ‘ ‘“ “ a" + * Rieter) Tae oO 
ee es ‘e es si + “ a: Waretety eel ae ie) 
047 “ ‘ ‘ “* + *“ ie ean agar ates 0 
040 “ “ss “ “e + + * Fett Sis aoe ie) 
033 — ss “ “ ue + “* MES igeeta ane es oO 
027 * ‘ “a te - + * CP on wate bse ae 
020. ‘ ‘ ‘e ” + * ste ayaa = 
013 “ “ “ as os + * iit seaay eraser = 
007“ “ ‘ ‘ ss + “ Bre we igre ely ei + 
distilled water elk Pte ane eke? + 
The small amount of growth obtained in peptone media 
containing urea nitrate at a concentration of 0.2 molar indicates 
that this is approximately its limit concentration. In peptone 
media containing ammonium tartrate at a concentration of 0.027 
molar, only microscopic mycelia were obtained. The toxicity of 
urea nitrate in starch media is four times as great as its toxicity 
in peptone media. The toxicity of ammonium tartrate, on the 
other hand, is approximately the same in starch as in peptone 
media. 
