276 KUNKEL: FACTORS INFLUENCING TOXICITY OF 
TABLE VII 
THE TOXICITY OF CUPRIC CHLORIDE IN SACCHAROSE, seet ip, LACTOSE, STARCH, 
D PEPTONE MEDIA 
Saccharose 5% | Glucose 5% Lactose 5% Starch Sh Peptone 5% 
A se eng | GM. Cone. | Cane” | G.M. Cone, | Rm | G.M. Conc. Growth edad ess 
CuCl, | 3 Days | CuCl, 3 Days CuCl, 3 Days CuCl, 3 Days CuCle 3 Days 
.001I00) — | .00r00 — | .000055~|.—-— | .00070 ~ .050 = 
-00005 — | ..000905 = -000050 _ -00065 — -045 
00090' +  .00090 oo .000045 _ .00060 _ .040 - 
00085}. + | .00085 - 000040 - .00055 035 si 
080| + | .00080 + 000035 — .00050 - .030 la 
00075| + | .00075 sale 000030 ~ 00045 + 025 =e 
00070}; + | 00070 + -000025 + .00040 + 020 + 
00065, + | .00065 + | .000020 + .00035 + (Ors + 
+0 + | .00060 on .000018 + .00030 + o1o + 
00055, + | .00055 + .0000I5 + | .00025 + 005 + 
Its toxicity in glucose and saccharose is approximately the same. 
On the whole, cupric chloride is little more toxic than ferric 
chloride, its average limit concentration being .004 molar. The 
influence of the various media on the toxicity of copper is of special 
interest because the salts of this metal are so much used in the 
making of sprays. The action of lime on the copper in Bordeaux 
mixture is not thoroughly understood although this important 
subject has been given considerable attention (see Fairchild, 7). 
TABLE VIII 
THE TOXICITY OF ZINC CHLORIDE IN SACCHAROSE, GLUCOSE, LACTOSE, STARCH, AND 
P 0. EDIA 
_Saccharose dealt | Glucose 5% ne Lactose 5% Starch 5% Peptone 5% 
GM. |c | h| ; 
aon | Growth G,. . a Ate | G.M. Conc, tn G.M. Conc, | er A gacd — 
ZnCle | 3 Days 3 Days | ZnClz 3 Days ZnCle | 3 Days |'ZnCk | 3 Days 
t | | } 
90050; — | .000300 | — | .00080 — | .000300 | — +050 ay 
00045 — | 000250 | .00075 — | 00200 | — 045 ie 
0004 + | .000200 —t: @0076 + 000100 — +040 ae 
00035. + | .000150 00065 + 000080 | — 035 ry 
00030, + 000100 + 00060 + 000060 + +030 ae 
00025 + | .000050 + 00055 + 000040 + 025 gs 
00020. + 000010 + 00050 a 000020 a 020 a 
00015 + | .000008 + 00045 + Peto f+ 15 “ 
00010 + =| .0000 + 00040 + 000008 | + 10 + 
005 + 000004 + -00035 + 0000 | ve | 7005 + 
Table VIII shows the toxicity of zinc chloride. It will be seen 
that it is most toxic in starch and least toxic in peptone. The 
