Increased Blood Sugar in Pigeons 379 



amount obtained indicates that the mid-ovulation stage had the 

 higher sugar value if the average values obtained for all birds of 

 its kind be taken as a standard (see table). 



If curves be formed from the individual determinations, by 

 placing them at their exact intervals with reference to ovula- 

 tion, and a separate curve made for each of the three groups, it 

 is found that the highest points fall within the mid-ovulation 

 period in all of the three curves. The curve for the "scragglies" 

 departs most widely from the curve earlier obtained for supra- 

 renal hypertrophy by Riddle. 1 If another curve be formed from 



Comparison of Amounts of Blood Sugar Obtained Within, and Apart from, 



Ovulation Periods. 





Periods with Reference to Ovulation 







and Amount of Elood Sugar. 





No. of 











Bird. 













Mid- 



Within 



More than 







ovulation. 



36 Hrs. 



36 Hrs. 





V65 



215 





175 





M386. . . . 



228 





158 





V27 



185 





228 (6-5) 1 



Common pigeons 



V270. . . . 



235 





180 





Ave. . . . 



216 





185 





V90 





. 143 



165 (4I-5) 1 





V241 .... 



230 





178 





V299 .... 



200 



130 



149 



"Scraggly" common pigeons 



V288 



173 



143 



145 





Ave. . . . 



201 



139 



160 





T149. • • • 



178 





153 





P7I5. 



180 





i35 Uhsh) 1 





T320 



175 





i55 





T171 



198 





i45 



Ring doves 



T153 ... 



153 





123 





T289 



150 





130 (6-5) 1 





Ave. . . . 



172 





140 





V205... 



220 







Common pigeon 



V28 





120 





Scraggly common pigeon 



V260 







160 





T282 



185 









T390.... 





155 





Ring doves 



T226 





160 







These determinations made at intervals so far removed (4.5 or more days) 

 from both earlier and later ovulations as to leave it uncertain whether ovulation was 

 in fact far removed or quite imminent — and a resorption of the ovum produced by 

 the heart-puncture employed to obtain the sugar sample. 



1 Loc. rit. 



