142 



THE GROUSE IN HEALTH AND IN DISEASE 



respectively. This table has been prepared to illustrate that birds 

 found sick show the same tendency to lose weight though they do 

 not record such a marked loss as those which have actually 

 succumbed to disease. 



CHART F 



Comparison of average weight of Sick Birds and of 

 BIRDS Found Dead ; both of Strongylosis. 



The curve shows that birds succumb at very different stages 

 of emaciation, in different months of the years. For example, 

 in the case of the cocks a bird will die at 20 ounces in February, 

 at 19 ounces in March, at 18 ounces in April, at 17 ounces in 

 Ma)^, and at IG ounces in June — the conditions of weather and 

 food making life easier month by month as warmth, sunshine, 

 and increasing abundance of food enable the sick l>ird to cling 

 to life a little longer. 



It is interesting too to note that in the case of the hens, 

 although the average weight in health is 23 to 24 ounces in 

 April and May, it falls in fatal disease to 16 ounces, whereas the cock 

 bird, whose average weight in health is also 23 to 24 ounces for 

 the same two months, succumbs at 17 '5 to 18 ounces. 



(6) General Helminthiasis, including all disorders due to worms in 

 birds of l)oth sexes and at all ages must also have a share in 

 causing loss of weight : (1) by disturbing the normal digestion and 



