BY DR. OSCAR KATZ. 553 



tlie under surface of the cutis, of about the size of a sixpence. 

 This appearance was not unlike that which is noticed at the seat 

 of inoculation with the virus of chicken-cholera in the case of 

 fowls and pigeons ; but while the substance of the yellowish sub- 

 cutaneous masses forming after inoculation in fowls and pigeons 

 are found to be crowded with chicken-cholera bacteria, in the 

 corresponding case of the rabbit these bacteria were exceedingly 

 scarce. 



Tests of Virulence tvith regard to Fowls and Pigeons. 



The next table (IV.), at the end, contains the results of 

 inoculations into fowls and pigeons, with heart-blood from 

 the first-mentioned rabbits as used in the Inoculation Series 

 v., X., XV., XX., of Table III. In reference to the first case 

 which I denoted as inoculated from Inoculation Series i., I 

 must state that, as the date (16th October) implies, that par- 

 ticular rabbit was not exactly the first dead of the first 

 generation as followed directly by the others ; this experiment 

 was added later on, when, on 14th October, a pigeon was 

 inoculated with a small quantity of the surface-growth of a 

 gelatine stick-culture of the microbe (fifth generation, 17 days 

 old), and after the death of the pigeon, which died between 14 h. 

 15 m. and 17 h. 5 m., a rabbit was inoculated (15th October) in 

 pretty much the same way as the two of the first series in Table 

 III. From this rabbit, which died between 12h. 30 m. and 15h. 

 45 m., the fowl and pigeon of Series i. of the following table were 

 inoculated. Therefore, I call Series No. i. simply inoculated from 

 Inoculation Series i. The conditions under which the five series 

 were inoculated, were, on the whole, corresponding to those stated 

 for the rabbits (Table III.) ; the seat of inoculation was an area 

 under the skin which covers the pectoral muscle. (See Table lY.) 



As evidenced by the data obtained and put together in this 

 table, the virulence of the microbes of chicken-cholera neither 

 increases nor decreases, perceptibly, in fowls and pigeons inocu- 

 lated with virus descending from rabbits of the first, fifth, tenth, 

 fifteenth, or twentieth Inoculation Series. The hours which it 



