Xll PREFACE. 



species. This doctrine concerning the primo-constituent parts of 

 the organic mass is now generally admitted or recognised, and I 

 need not, therefore, add anything by way of apology for it or 

 defence. 



In mine and Kieser's Bey tray en zur vergleichenden Zoologie, 

 Anatomie und Physiologic; Frankfurt bey Wesche, 1806, 4to, I 

 have shown that the intestines originate from the umbilical vesicle, 

 and that this corresponds to the vitellus. It is true Friedrich Wolf 

 had already discovered it in the chick, but his was only a single 

 instance, and completely forgotten. I have also discovered it and 

 without knowing anything about my being anticipated, since it was 

 nowhere taught. But I have elevated this structure to the light of 

 a general law, and it is that unto which I may fairly lay claim. 

 In the same essay I have introduced into the Physiology the Corpora 

 Wolfiana, or Primordial Kidneys, but, having failed to recognise 

 their signification, any one who pleases may filch away the credit of 

 their bare detection. 



In my Essay : Ueber die Bedeutung der SchMelknochen, (Ein 

 Programm beym Antritt der Professur an der Gesammt-Universitat 

 zu Jena; Jena gedruckt bey Gopfert, 1807, verlegt zu Frankfurt 

 bey Wesche, 4to,) I have shown that the head is none other than 

 a vertebral column, and that it consists of four vertebrae, which I have 

 respectively named Auditory, Maxillary or Lingual, Ocular and Nasal 

 vertebra ; I have also pointed out that the maxillae are nothing else 

 but repetitions of arms and feet, the teeth being their nails ; all this 

 is carried out more circumstantially and in detail in the Isis, 1817, 

 S. 1204; 1818, S. 510., 1823. litt. Anzeigen S. 353 und 441. 

 This doctrine was at first scoffed at and repulsed ; finally, when it 

 began to force its way, several barefaced persons came forward, 

 who would have made out if they could, that the discovery was 

 achieved long ago. The reader will not omit to notice that the above 

 essay appeared as my Antritts-Programm, or Inaugural discourse, 

 upon being appointed Professor at Jena. 



In my Essay entitled Ueber das Universum als Fortsetzung des 

 Sinnensy stems ; Jena bey Frommann, 1808, 4to, I showed that the 

 Organism is none other than a combination of all the Universe's 

 activities within a single individual body. This doctrine has led 

 me to the conviction that World and Organism are one in kind, 

 and do not stand merely in harmony with each other. From hence 

 was developed my Mineral, Vegetable and Animal system, as also 

 my philosophical Anatomy and Physiology. 



