18 
G. P. No. 7542. Six c. c. same serum+5 per cent formalin; 21 hours exposure; 
subcutaneously. Dead, 60 minutes. 
[Previous treatment: 35 days prior, 0.142 c. c. toxine No. c. c. anti- 
toxic horse serum (Mul 2100).] 
Control G. P. Six c. c. same serum-f-5 per cent formalin; 21 hours exposure; 
subcutaneously. Severe symptoms of formaldehyd poisoning. 
Antitoxic serum-|-l per cent formalin: 
G. P. No. 7501. Six c. c. antitoxic horse serum (Natl. IX) +1 per cent formalin; 
22 hours exposure; subcutaneously. Dead, 60 minutes. 
[Previous treatment: 41 days prior, 0.24 c. c. toxine No. O+aio c. c. antitoxic 
horse serum (Led 4D).] 
G. P. No. 7198. Five c. c. same mixture; 4 days exposure; subcutaneously. Marked 
symptoms. 
[Previous treatment: 59 days prior, 0.142 c. c. toxine No. 5+9^ c. c. anti- 
toxic horse serum (NYBH 305).] 
G. P. No. 7589. Five c. c. same mixture; 4 days exposure; subcutaneously. Mild 
symptoms. 
[Previous treatment: 37 days prior, 0.142 c. c. toxine No. 5 +yy^oo c. c. anti- 
toxic horse serum (Park ppt. 305-306).] 
Normal serum-]- 5 per cent formalin: 
G. P. No. 7776. Six c. c. normal horse (roan) serum^5 per cent formalin; 4 hours 
20 minutes exposure; subcutaneously. Mild symptoms. 
[Previous treatment: 46 days i^rior, 0.142 c. c. toxine No. 5+3^^ c. c. antitoxic 
horse serum (S 1351).] 
G. P. No. 7629. Six c. c. same mixture and exposure; subcutaneously. Slight 
symptoms. 
[Previous treatment: 64 days prior, 0.142 c. c. toxine No. c. c. antitoxic 
horse serum (A. ppt. 31).] 
G. P. No. 7689. Six c. c. same mixture; 4 hours exposure; subcutaneously. Slight 
symptoms. 
[Previous treatment: 56 daj'S prior, 0.142 c. c. toxine No. 5+gfo c. c. antitoxic 
horse serum (PDCo 080235).] 
While the above three pigs showed slight and mild symptoms of 
hypersusceptibilit}", thei^ all showed severe s}"mptoms of formaldeh 3 ^d 
poisoning. 
These results plainly show that formaldeh 3 "d, in the strength and 
time stated, does not apparently appreciabl 3 " influence the toxicit 3 " of 
horse serum. We have seen before that it also has no effect upon the 
sensitizing action, page 12. 
CALCIUM CHLORID. 
Netter® has shown that when 1 gram of calcium chlorid is given on 
the day of injection and on the two following days the number of 
«Netter, Arnold: EfBcacite de I’ingestion de chlorure de calcium comme moyen 
preventif des eruptions consecutives aux injections de serum. Compt. rend. soc. 
bioL, tome 60, No. 6, Feb. 16, 1906, j). 279. 
: Influence des quantites de serum injectdes et du nombre des injections sur 
les eruptions seriques. Necessite d’augmentei les quantites de sels de chaux dans les 
cas d’injections repetees ou superieures a quarante centimetres cubes. Idem, p. 281. 
