172 



Tests with Precipitins 



of this antiserum very well demonstrates a fact to which I have already 

 drawn attention, namely that a weak antiserum is more limited in its 

 action. 



II. Antisera for bloods of Insectivora. 



Uhlenhuth (25, vn. 1901) treated rabbits with the serum of the 

 hedgehog (Erinaceus europaeus) and obtained an antiserum which only 

 acted on the blood of the hedgehog, he tested 24 bloods as follows : 



Man, hedgehog, bat, dog, fox, cat, pig, deer, ox, sheep, goat, horse, 

 donkey, rabbit, guinea-pig, rat, mouse. Fowl, pigeon, owl, crow, sparrow, 

 duck, goose. 



383 Tests with Anti-Hedgehog Serum. 



The following tests were made with a powerful antiserum (Preci- 

 pitum = -022 c.c.) obtained by injecting a rabbit with the mixed serum 

 of four Erinaceus europaeus (No. 135). In view of the continued 

 negative results with different anti-mammalian sera upon non-mamma- 

 lian bloods, these tests were limited to mammalia. 



Reactions 



85 PRIMATES 83 



27 CHIROPTKRA 2G 



15 INSECTIVORA (4 families) 



6 Erinaceus enropaeus 



1 Crocidura coerulea 1 



G Talpa europaea 6 



2 Centetes ecaudatus 1 



92 CARNIVOBA 87 



58 RODENTIA 58 



G5 UNGBLATA 60 



3 CETACEA 3 



12 EDENTATA 12 



25 MARSCPIALIA 25 



1 MONOTKEMATA .. 1 



With other than its 



homologous scrum 



3-5% 



The foregoing table shows a very limited action on the part of this 

 antiserum, only the blood of Erinaceus europaeus giving a full reaction. 

 The tests with other Insectivora were negative, with the exception of 

 one sample from Centetes ecaudatus which only gave a faint reaction 

 such as was observed in a few instances amongst the other mammalia. 



