190 ExpermienU on the Rotifer Hydatina 



These are the details of a similar experiment. A thelytokous 

 female was taken from XXXIV shown in the detailed test, which was 

 producing few arrhenotokous females. The results in the horse manure 

 solution were 115 thelytokous females and 5 arrhenotokous females. 

 The table shows the results of a thelytokous female in the green 

 protozoa culture. 



T T A 



-. \ 



AAAATTTTTAAAAAAAAAAAA 5 16 



\ 



AAT^'TTATTAA 6 5 



These experiments indicate that the increase in the number of 

 arrhenotokous females is due to the change from the horse manure 

 solution to the green protozoa culture and this is proved by subsequent 

 experiments. It is to be noted that an increase takes place in the first 

 generation. 



Experiment II. A thelytokous female not taken from a tested 

 family was put in the green protozoa culture. A thelytokous female 

 of the second generation was transferred to the horse manure solution 

 which was very concentrated and the protozoa of which were very 

 numerous. The family was continued in this solution 



T in green protozoa food T A 



**TTAATTATATATTAAAA 8 9 



_J 



** A A A A A*T T A A A AT AT 4 10 



* r in horse manure solution T A 



\ 



A A AT T T 33 



\ 



T T T AT T T T T T T A T T T T T 15 2 



T T T A T AT T T A T T AA A T A T A T T A A A A A T T T T T T T T T A 22 14 



I 



T T T T T T T T ATT T T T T T T T T A T T T T T T T T T T T T T T T T 34 2 



2^ j^ X X T T T T T T T T T T T T T T T TTTTTTTTTTTTTTTTTTTTT 40 

 T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T 37 



T T 2 



J 



T TT T T T T T T T T T T T T T TTT T T T T T T T T T TTTTTTTTTTT 39 



J 



T TTT TT T T T T T T T T T T T T T T T T T T T TT T TT T TT 33 



** The parents and many eggs in these two generations were killed through being 

 exposed to the sun's rays on a hot day. 



