GUAM AGRICULTURAL EXPERIMENT STATION. 35 



twice daily medicated drinking water made up as follows: To 1 

 gallon of biclilorid of mercury solution, 1 : 10,000, was added 3 grains 

 of citric acid and one 30-gi'ain sulphocarbolate tablet. 



On April 14, 1915, hatch No. 12, consisting of 56 strong, hardy 

 chicks, was taken from the incubator, in which it had remained 52 

 hours after hatching, and divided into two lots of 28 chicks each. 

 Pen No. 1 was given a morning feed of bread crumbs slightly mois- 

 tened with the antidiarrhea medicine noted above. The medicated 

 water was also given for their drinking water throughout the day. 

 Pen No. 2 was given no medicinal treatment. The summarized 

 results show that at the end of 15 days of treatment 2 chicks had 

 died from white diarrhea in pen No. 1, and the remaining 26 chicks 

 were strong and hardy, while in pen No, 2, 26 chicks had died from 

 white diarrhea, and the remaining 2 chicks were affected with the 

 disease and were stunted and emaciated. The chicks in both pens 

 did well until the fourth day, when two cases of diarrhea appeared in 

 pen No. 1. At the end of the first week the 22 chicks in pen No. 2 

 were less active and alert and less eager for feed than the 27 chicks 

 remaining in pen No. 1. 



All of the chicks hatched at the station since that date have been 

 given medicinal treatment in their drinldng w^ater, and the losses from 

 white diarrhea have not averaged more than two chicks per hatch. 

 In the absence of proper treatment and the presence of such predis- 

 posing causes as improper brooding and poor feeding the mortality 

 nill run bet^veen 90 and 100 per cent. By eliminating all predispos- 

 ing causes and using the treatment above recommended the mortality 

 should be reduced to 5 per cent or less. 



CHICKEN POX OR .SOREHEAD. 



Chicken pox is the most widely disseminated poultry disease on this 

 island (PL VII, fig. 1). The disease generally makes its appearance 

 near the close of the dry season, or immediately following the first 

 heavy rains of the wet season. Chicks at this time are usually in 

 poor condition and susceptible to any disease. 



The first symptom noted is the appearance of wartlike nodules, 

 brown in color and matted down to the skin by a sticky exudate which 

 gives off an offensive odor. These scabs are located on the comb, 

 wattles, eyelids, face, angle of the mouth, ear lobes, and, in fact, all 

 parts not protected by feathers. Only in rare cases does the disease 

 affect the feathered portion of the fowl. The scabs vary greatly in 

 size, some being not more than a millimeter in diameter, others cov- 

 ering the entire head. "Where the angle of the mouth is affected, 

 the disease may ultimately find its way to the intestines and here set 

 up a diseased condition. Where the eyelids are badly affected, the 



