INTRODUCTION. 



PREFATORY REMARKS. 



THE researches of Kowalevsky with regard to the 

 development of the AmpMoxus, published in the year 

 1867, aroused the keenest interest in zoologists. This 

 work may well be styled the beginning of the new 

 epoch in comparative embryology, the way to which 

 was thereby paved, and which received so great an 

 impulse through Kowalevsky's further and more 

 extensive investigations. Indeed, it may be said that 

 it owes its foundation to his exertions alone. 



By means of subsequent additions to, and correc- 

 tions of, his earlier writings, Kowalevsky brought new 

 facts to light, which strengthened the attention which 

 had universally been given to a matter of such im- 

 portance as the development of the Amphioxus. 



It was very generally felt quite necessary to further 



B 



