304 



APPENDIX A 



coats ; further, the eggs taken from the uterus were placed 

 haphazard on the slides with the axis making any direction with 

 the vertical. The egg takes about half-an-hour to turn into its 

 normal position with the axis vertical, and during this interval 

 gravity may possibly act upon the yolk and protoplasm, of 

 different specific gravities, and impress a plane of bilateral 

 gravitation symmetry upon the egg, as occurs when the egg is 

 permanently inverted (see above, pp. 82-87). This obliquity of 

 the axis may possibly affect the relations between the planes, 

 and the mutual compression may also be a disturbing factor, 

 since it is known that in compressed eggs the nuclear spindle is 

 perpendicular to the direction of the pressure (pp. 34-36). 



These angles have therefore now been measured under four 

 different conditions : 



(a) The eggs are close to one another in the rows and the axis is 

 horizontal: (Since the rows are parallel to the length of the slide 

 the pressure, if any, must be in the same direction, while the 

 surfaces of compression or contact are across the slide. The eggs 

 were always so placed that the vegetative poles faced in one 

 direction and the planes of ' gravitation symmetry ' were at right 

 angles to the length of the slide. This holds good of all the 

 following experiments.) 



(/3) The eggs close, but the axis vertical with the white pole 

 below. In these there can be no gravitation plane of symmetry. 



(y) The eggs spaced, but the axis horizontal. In these the 

 jellies do not touch. 



(8) The eggs spaced and the axis vertical. In these, therefore, 

 both the supposedly disturbing factors are removed. The results 

 are given in the following table : 



First Furrow and 

 Sagittal Plane. 



(a) 0- = 3842 + .70. 

 p = -201 + -028. 



O) 0- = 3344 + -56. 

 p = -352 + -021. 



(y) 0- = 3349 -96. 

 p = 292 + -039. 



(fi) a = 3145 + -73. 

 = - 364 + -033. 



B 



Plane of Symmetry 

 and Sagittal Plane. 



<r= 31-86 + -56. 

 p = -263 + -027. 



r = 30-17 + .51. 

 p = -276 + -022. 



<r = 27.53 + -84. 

 p = .399 + -036. 



<r = 26-80 + -82. 

 p = 451 + -035. 



Plane of Symmetry 

 and First Farrow. 



0- = 41-59 + .84. 



P = . 118 + .029. 



0- = 39-71 + -61. 

 p = -023 + -024. 



r = 36-60 + 1-108. 

 p =.075 + -043. 



<r = 3446 + 1-065. 

 = . 186 + -043. 



It is evident from this that gravity and ' mutual compression ' 

 (as I will for the moment term it, though it is doubtful whether 

 the pressure has anything at all to do with the result) do affect the 

 magnitude of the angles between these three planes, for in each 



