448 VEDDER AND CLARK. 



were given daily 10 grams of boiled potatoes. One fowl developed neuritis 

 after twenty-five days' feeding, 1 fowl developed neuritis after fifty-nine 

 days, and 2 fowls remained well after sixty-three days, when the experiment 

 was discontinued. 



Experiment SI. — Four fowls were fed on polished rice, and in addition 

 were given daily 10 grams of white wheat bread such as is issued to troops. 

 One fowl developed typical neuritis in twenty-six days, 1 in twenty-seven 

 days, and 1 in thirty-two days. One fowl remained well after forty-eight 

 days, when the experiment was discontinued. 



Experiment 32. — Four fowls were fed on polished rice, and in addition 

 were given daily 10 grams of raw beef. One fowl developed neuritis in 

 nineteen days, 1 in forty-eight days, and 1 in fifty-seven days, while 1 fowl 

 remained well after sixty-three days, when the experiment was discontinued. 



Experiment 33. — Four fowls were fed on polished rice, and in addition 

 were given daily 10 grams of boiled beef. One fowl developed neuritis in 

 twenty-five days, while the other 3 fowls remained well after sixty-three 

 days, when the experiment was discontinued. 



Experiment 3k. — Four fowls were fed on polished rice, and in addition 

 were given daily 10 grams of dried peas. All 4 fowls remained in perfect 

 health when the experiment was discontinued after sixty-three days' 

 feeding. 



Experiment 35. — Four fowls were fed on polished rice, and in addition 

 were given daily 5 cubic centimeters of canned milk (Highland Cream). 

 One fowl developed neuritis in nineteen days, 1 in twenty-three days, and 

 1 in thirty-two days. One fowl remained well after sixty-three days' 

 feeding. 



Experiment 36. — Four fowls were fed on polished rice, and in addition 

 were given daily 5 cubic centimeters of fresh cow's milk. One fowl devel- 

 oped neuritis in twenty-three days, 1 in thirty-one days, and 2 fowls 

 remained well after sixty-three days. 



Experiment 37. — Four fowls were fed on polished rice, and in addition 

 were given daily 10 grams of unroasted peanuts. One fowl died of avian 

 diphtheria after twenty-eight days' feeding without developing neuritis, 

 and the other 3 fowls remained well after sixty days' feeding. 



It should be noted that in all of these experiments the birds 

 were fed these different articles of diet by hand, so that there 

 can be no doubt as to what they actually received. It is a striking 

 fact that the only two of these groups that received complete 

 protection were those in which the fowls were given a daily 

 addition of 10 grams of dried peas and 10 grams of peanuts. 



v. SUMMARY. 



1. There appear to be three types of polyneuritis gallinarum: 

 (a) A form in which the symptoms of neuritis and those 

 of general prostration are combined. This is the usual form. 

 When these birds are given an extract of rice polishing, they 

 improve at once in general condition, but the symptoms of neuritis 

 only disappear after several months of treatment.. 



