386 



E. L. CLARK AND E. R. CLARK 



Stage 1 (6 d., 12§ hrs.) 

 (GL. 20 mm.) 



before chloretone. . . . 



after chloretone 



after recovery 



Stage 2 (7 d., 2U hrs.) 

 (GL. 24| mm.) 



before chloretone. . . . 



after chloretone 



after recovery 



Stage 3 (8 d., 16 hrs.) 

 GL. 27 mm.) 



before chloretone. . . . 



after chloretone 



after recovery 



Stage 4 (8 d., 23 hrs.) 

 (GL. 29 mm.) 



before chloretone. .'. . 



after chloretone 



after recovery 



Stage 5 (13 d., 2 hrs.) 



no chloretone 



45'. 



15' 



16' 



°12' 50" 



7' 20" 



20' 10" 



37' 50" 

 11' 22" 

 17' 34" 



16' 28" 

 18' 12" 



7' 8" 



18' 51" 



^s 



) O as 

 PS ^ 



H O O - T^ 



S 55 »; a g 



a 



O b 



13" 



none 



11" 



" « fc H S 



> C^ O B. O 



28.5" 

 none 

 19" 



not rec. 



54" 

 1' 06" 



20" 1' 06" 

 none 



1' 23" 

 1' 31" 

 1' 08" 



I £! *> B. 



S a " - Z 

 z« 



n ^ "^ 



S o m H o 



3.3 



3.8 



5 3 

 5.6 



6.3 



6.8 



« £ a fe 



s B o o 



1^ ;^ "* J 



s S s j 



Z K Z > 



w 6 « 



1.6 



l/9(') 

 1.8 



4/5^1) 

 5.6 



3.4 I 2.6 



I 



not rec. 5t0 



3.4 



« & !^ 



H K Z 



- - K 



Z X m 



0. B4 



« S ^ 



K "■ -< H 



5 t. &; f< 



^ O B P 



3.8 

 3.3 



5.1 

 4.7 

 5.1 



6.7 

 4.3 

 6.8 



4.5 

 8.0 

 5 



4.8 



Chart 2 Shows the results of estimations as to average duration of periods of 

 movement, etc., before, during and after the use of chloretone, at the various 

 stages. The records used for this chart are the ones from which the selections 

 in chart 1 were made: (1) (Stage 2) means that approximately one lymph heart 

 pulsation occurred in each nine periods of rest; (1) (State 3) means, similarly that 

 in each five periods of rest four single lymph heart pulsations occurred. 



movements (unless the heart is actually punctured), was not 

 observed by Budge, Sala, or Mierzejewski. These investigators 

 all state that no contractions of the lymph heart occur before 

 the ninth day of incubation. In all probability, this is due to 

 the fact that the eggs, which they used, were opened in water and 

 submitted at once to unfavorable conditions of temperature. In 

 such a case the periodic movements of the embryo would cease 



