OKLAHOMA ACADEMY OF SCIENCE 61 



pretation difficult. On the whole, however, the data seems to 

 justify the conclusion that no effect is produced. 



Briefly," the experiments indicate that potassium hydroxide, 

 ammonium hydroxide and sodium hydroxide in weaker concentra- 

 tions show a tendency to accelerate fission rate in Paramoecium, 

 while these hydroxides in higher concentrations have an inhibitory 

 effect. Barium hydroxide, strontium hydroxide, and calcium hyd- 

 roxide show no effect, neither accelerating nor inhibiting reproduc- 

 tion. These results, while not so far reaching as might be wished, 

 agree with the observations of Richards on Haminca eggs. It is 

 suggested that those hydroxides which hasten division rate, do so 

 because of their ability to hasten the oxidative processes of the 

 cell. It is of significance that the hydroxides which were found to 

 accelerate the rate of cleavage in the eggs have produced the same 

 results in Paramoecium, while those which had no effect on Ham- 

 inca also showed no variation in the protozoon. 



IX. NESTING RECORDS FROM 1920 TO 1922 FROM 



NORMAN, OKLAHOMA 



Margaret M. Nice 



The extensive planting of trees in the town of Norman and on 

 the University campus has made this region an unusually attractive 

 nesting place for some species of birds. Mourning doves, grackles, 

 mocking birds, brown thrashers and robins have been especially 

 responsive to the opportunities offered them, and their nests may 

 be found here in great abimdance. 



The numbers of nests of native birds found by my daughter 

 Constance and myself in this vicinity from 1920 to 1922 follow: 

 Year No. of Species No. of Nests Successes Failures 



1920 27 219 38 62 



1921 19 205 41 48 



1922 24 187 39 40 



Total 37 612 118 150 



In 3 cases (field sparrow, blue grosbeak and sycamore warb- 

 ler), the nests could not be found, but the parents v/ere seen with 

 food in their bills. The total number of nests should be a little 

 larger for we failed to record all the grackle nests seen. As to 

 the successes and failures, most of the nests were not visited often 

 enough to determine their outcome, so it is only in the case oi 

 mourning doves of which we made a special study that the figures 

 for successful and non-successful nests are at all representative. 



