206 



Artificial Incubation. 



[JULY, 



A comparison with the previous year indicates that no incubator 

 reached the record of 1904-5 (96-82), whilst in each of the three 



[Ofr^ 'IMJU^ i^tidti QjJ^ ilf-J/. dsP. W. 9^. ^^-i' 



Fig. 2. — Monthly Percentages of Fertile Eggs Hatched. 



classes worked that year much lower percentages were made in 

 1905-6. 



In the previous twelve months the highest percentage of 

 hatches in any one month was in October, 1904 (87*6 1), and 

 the lowest was in May of the same year (70" 17). From 

 Diagram II. it will be seen that the highest monthly per- 

 centage during the year under review was in September, 1905 



Oi^lh hxuj imJL. iulu Oajj. ifJik &d'. iH^. 



Fig. 3. — Monthly Percentages of Hatchings in Tank 

 AND Hot-air Machines. 



(83*47), and the lowest in August, 1905 (64"68). The monthly 

 variations were much greater than in 1904-5. 



It is remarkable that working with the same m.achines under 

 identical conditions results vary so greatly. Table III. gives 

 the highest and lowest percentages for each month. Working 



