ON GENERATION. 237 



both points are situated in the centre of the resolved fluid, and 

 near the root of the veins which thence arise; hut they are never 

 seen simultaneously: in the place of the white point there appears 

 a red and palpitating point. 



That portion of Goiter's sentence, however, where he says : 

 ' ' the punctus saliens is now seen in the albumen rather than 

 in the yelk/' is perfectly accurate. And, indeed, moved by these 

 words, I have inquired whether the white point in question is 

 turned into the blood-red point, inasmuch as both are nearly of 

 the same size, and both make their appearance in the same 

 situation. And I have, indeed, occasionally found an extremely 

 delicate bright purple circle ending near the ruddy horizon 

 surrounding the resolved liquid, in the centre of which there 

 was the white point, but not the red and pulsating point ap- 

 parent ; for I have never observed these two points at one and 

 the same time. It were certainly of great moment to deter- 

 mine : Whether or not the blood was extant before the pulse ? 

 and whether the pulsating point arose from the veins, or the 

 veins from the pulsating point ? 



So far as my observations enable me to conclude, the blood 

 has seemed to go before the pulse. This conclusion is supported 

 by the following instance : on Wednesday evening I set three 

 hen's eggs, and on Saturday evening, somewhat before the same 

 hour, I found these eggs cold, as if forsaken by the hen: having 

 opened one of them, notwithstanding, I found the rudiments of 

 an embryo, viz., a red and sanguinolent line in the circum- 

 ference ; and in the centre, instead of a pulsating point, a white 

 and bloodless point. By this indication I saw that the hen had 

 left her nest no long time before; wherefore, catching her, and 

 shutting her up in a box, I kept her upon the two remaining 

 eggs, and several others, through the ensuing night. Next morn- 

 ing, very early, both of the eggs with which the experiment was 

 begun, had revived, and in the centre there was the pulsating 

 point, much smaller than the white point, from which, like a 

 spark darting from a cloud, it made its appearance in the 

 diastole; it seemed to me, therefore, that the red point emanated 

 from the white point; that the punctum saliens was in some way 

 engendered in that white point; that the punctum saliens, the 

 blood being already extant, was either originally there produced, 

 or there began to move. I have, indeed, repeatedly seen the 



