80 



TECHNICAL BULLETIN 5. 



ovarian tissues, and lumbar region of the spinal cord. In this so-called 

 "paralysis" all birds during life showed a rather bright red comb, the 

 paleness being evident only a short time before death. There was never 

 found at autopsy a marked leukemia. In fowl typhoid this leukemic 

 condition is highly prominent, and for this reason Moore has called this 

 paratyphoid type of infection ' ' infectious leukemia. ' ' Hadley has observed 

 a similar epidemic in fowls showing pronounced leukemic symptoms 

 associated with Bad. pullorum. The writer has never observed this con- 

 dition in relation to Bact. pullorum infections in adult birds. 



From these observations on the 83 paralytic birds, with only 5 showing 

 the presence of the Bad. pullorum infection, — these five probably having 

 carried the infection since chickhood, — the evidence does not indicate 

 that the paralytic disease so widely distributed at certain periods of the 

 year in Massachusetts is due to the presence of either the pullorum or 

 sanguinarium type. 



Influence of Infection upon the Hatching Quality of Eggs and upon the 

 Viability of Young Stock. 

 In 1917 and 1918 several sets of experiments were carried out under 

 the best known conditions for poultry husbandry. Eggs from 60 hens 

 known to have reacted positively to the agglutination test were set in an 

 electrobator. When tested at the end of the first seven days of incubation, 

 30 were found to be infertile and 2 were found dead in the shell. Of the 

 28 left, 10 were hatched; 3 chicks died at the end of the first day and 

 Bad. pullorum (aerogenic type) was isolated from the unabsorbed yolk. 

 All eggs containing fully developed chicks were examined especially for 

 Bad. pullorum, with the following results. The egg number in each case 

 represents the number of the hen laying the egg. 



Table 4. — Results of Tests for Bacterimn P^dlorum in Dead Chicks 

 from Eggs laid by Positively Reacting Birds. 



+ = present. 



= not present. 



